DOCTOR NIGHTLIFE tips her prescription pad to Billy Price & the Keystone Rhythm Band, who vamp out of the nightlife with a pair of farewell appearances, Friday at the Roxy ($10; 296-9292) and Saturday at Baltimore's 8 X 10 ($9; 301/652-2000). After 13 years, what luckier date to separate than Friday the 13th? Elsewhere: FRIDAY IS ANY BODY LISTENING? --

If you don't follow New Age, you may have missed the success of the D.C.-based Nuage (pronounced noo-ahj and signifying "cloud"), a record label that is so far a vanity press for synth-guitarist-tech Nicholas, a k a Nuage prez and perennial entrepreneur Stephen J. Nicholas. His "Bodymusic" album, which is a big hit on the world-music charts, is the ultimate in sleek, designer-cologne background music: part George Benson, part Quiet Storm synth. It was inspired by Nicholas's other home, Maui, which probably explains why on the album cover he doffs his office hornrims in favor of Pan-style leis. Nicholas makes a rare live appearance at Joe & Mo's (659-1211) Friday and Saturday in temporary relief of Doc Scantlin's flagrant '40s big band, making that upper-crust grill the Evel Knievel of the generation gap.

ALL THAT JAZZ --

The Museum of Natural History's Baird Auditorium hosts a mini-seminar on "The Joys of Jazz" on three successive Fridays, starting at the roots with spirituals by Donald Vails's Salvation Corporation Choir, country blues from banjo legend Archie Edward and ragtime piano by Alex Hassan. The other two programs focus on the early Jelly Roll jazz and postwar groups. Series tickets are $15 (for students) to $40, and individual concert tickets will be available; call 357-3030 for more information.

FINEST IVORIES --

The prestigious William Kapell Piano Competition -- first prize is $20,000 and a recital at Lincoln Center -- is underway at the University of Maryland in College Park, with preliminary rounds through Wednesday at Tawes Theatre ($8 at the door). Of 156 initial applicants, the field is down to about 40 from 14 countries, including eight Soviets. The three finalists will each play a 45-minute solo recital Thursday at 7 in the Kennedy Center Concert Hall ($10 to $15; 467-4600); and a concerto apiece next Saturday (July 21) at 8:30 with the National Symphony Orchestra and conductor Stanislaw Skrowaczewski ($15 to $25; 467-4600). There are also master classes and lectures by such artists as Menahem Pressler and Walter Klien; for more information call 454-5276.

STILL HAVE A DEAD HEAD? --

If last Thursday night's annual Grateful Dead pilgrimage to RFK Stadium didn't sate you, head up to the Dragon Restaurant in Wheaton Friday and Saturday for the perversely named Awakening, a second-generation Deadhead band headed by ex-Jellos John Balac and Brian Chavitz, plus Rampage drummer Wayne Eubanks and Shades of Blue guitarist Darryl Bailey ($3 and ID; 949-1200).

SATURDAY WATER MUSIC --

It's lush, it's liquid, it's liberally dosed with dream images. Glasgow's new darlings of chiarascuro pop, Blue Nile, plunges into the depths with the first live performance of their seven-year, two-album career, at Georgetown University's Gaston Hall ($18.50; 800/543-3041).

JANIS-HEADED FOLK --

For a New York girl, Janis Ian always was a little uncomfortable in the spotlight, preferring the shadows of club life and the view of other shadowy lives. Maybe that's why she likes living in Nashville; she can sit in the Boardwalk with endless cups of coffee and a wrinkle of reserve between her eyes, collaborating on country songs that are better than the ordinary, and not so challenging as her own once were. Music City Row, after all, is just Tin Pan Alley with a backbeat (at the Birchmere; $16.50, 432-0200).

SUNDAY ST. LOUIS BLUES --

In Japan, he would be a Living National Treasure: Longtime St. Louis blues legend Henry Townsend, the singer, piano roller and acerbic, wailing guitarist, performs at the Museum of Natural History's Baird Auditorium ($16; 357-3030).

BEBE, CECE, OUI OUI --

The great BeBe and CeCe Winan head up a fellowship of Christian singers who take the stage at 8:30 at Carter Barron. Tickets are $11 at Woodies or by phone charge, 432-0200; remaining tickets go on sale Saturday morning at the Carter Barron ticket window. For information call 619-7222.

BLOOMIN' WONDERFUL --

In Liam O'Maonlai, Hothouse Flowers has the greatest soul shouter to come out of Ireland since Van Morrison. However, though O'Maonlai and schoolchum Fiachna O'Braonain are just as fluent in the ancient ways -- they met at a Gaelic-speaking school, and O'Maonlai was all-Ireland bodhran champ -- they are more exuberant than insinuating. And there is something about their forthrightness that echoes their name -- such stubborn political simplicity must require careful tending in Dublin (at the Bayou; $12.50, 333-2897).

MONDAY BLOND RENDITION --

One of the Nashville dollies who includes a half-Janis Ian lament on her album, coincidentally, is Susi Beatty, a twang-and-throb singer, originally from Alexandria, who could use some help escaping the Music City formula (at Zed in Alexandria, 768-5558).

TUESDAY BANJO, FIDDLE AND FREE --

"Banjo Dancer" Stephen Wade takes his long-running Arena show on the road, in a trio that also includes Hickory Wind fiddler Sam Morgan and Celtic-folkie guitarist Zan McLeod, when Takoma Park hosts a free folk concert and BYO picnic. Music starts at 7:30 on the grounds of the Takoma Park Municipal Building at 7500 Maple Ave.; for more information call 270-4048.

HERE'S LOOKING AT YOU, KID --

Woogie woman Deanna Bogart is "Out to Get You," according to her new Blind Pig Records release; and to prove it, she kicks off a whirlwind series of flash-boogie dates at Blues Alley ($10; 337-4141). (Actually, she's been out to get somebody since she was 6, when the New York Conservatory of Music decided she was "incorrigible" and gave her the boot.) Her current band includes Professor Mac Walter on guitar, Steve Wolf on Bass, Timm Biery on drums and old friend Ron Holloway on sax, which frees Bogart up for boogieing on the piano, although she still draws on that reed from time to time. She sings like a sax player, too; lots of slides and shape-shifting vowels. Bogart plays the King of France Tavern July 20 and 21, followed July 22 by a Birchmere date with truly down-and-dirty Leon Russell; for more info call 301/489-5030.

MAIDEN EFFORT --

Iron Maiden frontman Bruce Dickinson is out without the boys, with a relatively restrained album that's making a pitch for broader radio play. Of course, by Iron Maiden standards, any broads are a broader audience (at the Bayou; $12.50, 333-2897).

WEDNESDAY LANGUAGE BARRIER --

It only took eight years for "I Melt With You" to penetrate the general American radio ear, but it was worth it: The renewed Modern English performs at the 9:30 club ($14; 393-0930). Now, if they can just remember what they were after before they were famous.

THURSDAY CRESCENT CITY KIDS --

New Orleans jazz scion Wynton Marsalis is the Robert Penn Warren of trumpet, winner of Grammy Awards in both classical and jazz categories. Marsalis brings his ensemble -- but regrettably, none other of his clan -- along with the Dirty Dozen Brass Band to Wolf Trap ($18 reserved seats, $12 lawn; 432-0200 for tickets, 255-1860 for information).

SISTERS ARE DOING IT FOR THEMSELVES --

The Chenille Sisters are just what their name implies -- a funny, folk-poppy harmony trio singing tales of bathrobe-and-mules adolescence, bouffant envy and major-appliance phobia -- except they're not related. Actually, they're like a cross between the Roches, Betty, the Andrews Sisters and the Housewives, that Glo-Coat-eyed trio that shows up playing kitchen implements on the "Home Show" every time you have the flu. The Chenilles are in town for a double-header, Thursday at Baird Auditorium ($16, $10.80 for seniors; 357-3030) and Friday at a special Weathervane concert at the Montgomery Playhouse in Gaithersburg ($15; 800/448-4686).