DOCTOR NIGHTLIFE, who was also raised on the radio, is grateful for the chance to see the (temporarily) reunited Ravyns at Zaxx ($6; 703/569-2582). Elsewhere:

FRIDAY

POSITIVE RETURN -- A change of venue, not a change of heart: The Positive Force concert to benefit the unfortunate depositors of the failed Latin Investment Corp., featuring Fugazi, Nation of Ulysses and Admiral, has been moved from the previously announced Wilson Center to Sacred Heart Church, 16th and Park NW ($5; 703/276-9768).

WASHINGTON WEB SWINGERS -- Some of the most freehanded, lithe and resilient original music around (actually, a web is a perfect analogy) is woven by Daddy Longlegs, an eight-armed creature featuring ex-Grazz Matazzers Akira Otsuka on mandolin and lap steel and Fred Smith on bass; AV vet Vicky Pratt Keating up front and reformed Assassin Brian Alpert on drums (at the Coffeehouse at Otterbein Methodist Church, Sharp and Conways streets in Baltimore: $5 includes snacks; 301/922-5210).

POURING IT ON -- Meanwhile, it's a double espresso weekend -- a coffeehouse twofer -- for the strong brew and lemon twist wry of frank-folk theorist Tracy McDonnell, Friday with the Estrogenics at the Potter's House in Adams-Morgan (pass the hat style; 202/232-5483) and Saturday solo at the Coffee House at Good Counsel High School in Wheaton, a k a the second-floor library ($4; 301/680-8669).

RAYDIO WAVES -- Loudoun County may be slow on the uptake, but after six years, even the easy-going Raydio Flash Cab has to make a record. The gently Garcia-graying RFC (so comfy that their version of John Hiatt's "Drive South" almost isn't bent enough) celebrates the release of "Pizza With Phyllis" Friday and Saturday at the China Star/Club 88 in Leesburg's Prosperity Center ($3; 703/771-1650).

NAP'S NEW TEXTURE -- If you watch "Cosby," you know Nappy Brown. Indirectly. Despite a spate of hits for Savoy Records in the '50s, his "Night Time Is the Right Time," used on an episode of the Cosby sitcom, was credited to Ray Charles, and Brown never received any royalties. His voice has softened and broadened a little (his version of Gregg Allman's "It Just Ain't My Cross to Bear" sounds oddly like Van Morrison), but he's capable of tossing up a little funk when the spirit hits him (with longtime John Lee Hooker collaborator Eddy Kirkland at Baltimore's 8 X 10: $6, 301/625-2000).

. . . BUT YOU CAN'T TUNE A TENUTA -- Just by walking on stage, comic Judy Tenuta manages to skewer most actress-as-goddess stereotypes: the sarong silent type, the Vanna/Venus toga party girl, the hippie woman/child. She even dressed up as Cher for "Friday Night Videos," but co-host Sonny stalked off. But when she opens her mouth, spits her gum on some adoring "stud puppet" and raunch-roasts him in song, all likenesses end. Friday at 8:30 and 10:30, Saturday at 7, 9 (standby only) and 11 and Sunday at 8 at the Comedy Cafe ($15; 202/638-5653).

SAFETY IN NUMBERS -- 1991 must be the year of the single-instrument ensemble: The Andreyev Balalaika Orchestra, the World Saxophone Quartet, the Rounder Banjo Roundup, and now the Modern Mandolin Quartet (at the Barns of Wolf Trap: $12; 703/938-2404). Ditto the Dutch Recorder Quartet (3 Sunday at U-Md.'s Center of Adult Education, University Boulevard and Adelphi Road: $17, 301/403-4240): Sure, there are only four of them, but they play three dozen recorders.

SATURDAY

ROAD HOUSES AND REVIVALS -- The essential dichotomy of Southern black music, the roadhouse and the meeting house, inspires "Saturday Night and Sunday Morning," a blues, juba dance (buck-dancing with body percussion -- Sandman Sims meets Keith Terry) and gospel concert at GWU's Lisner Auditorium ($18; 800/448-9009 or 202/432-0200). The Virginia-turned-New York blues brothers Sherman and Wendell Holmes sing soul-and country-flavored R&B over a sometimes hard blues base. Piedmont blues guitarist John Dee Holeman is also a renowned juba dancer; and the extraordinary Fairfield Four ('twas three, 'tis five, and has been salvation to many) are proof of the gospel influence on the sweet harmonizing of the Mills Brothers and Ink Spots.

JAZZ-MATAZZ -- The Potomac River Jazz Club's annual Jubilee for the Leukemia Society features 11 area trad-jazz bands, plus numerous special guest sets, rocking nearly round the clock. Music starts at noon at the Sheraton National in Arlington (Columbia Pike and Washington Boulevard), with Buck Creek, Southern Comfort, Last Chance, Big Bertha's Rhythm Kings, Federal Jazz Commission and the Pontchartrain Causeway New Orleans Jazz, among others; breaks between sets feature the likes of Brooks Tegler and Daryl Ott ($18; 703/698-7752).

IONA TRIONA -- The Celtic duo Iona is now a trio -- singer Barbara Ryan, guitarist Bernard Argent and newcomer Diana McFadden on cello, mandolin, Celtic harp and bouzouki -- and they open the season at the Old State House in Historic St. Mary's City ($5; 301/862-0990). Dinner reservations at Farthing's Ordinary, the restored 17th-century tavern next door, include concert seating (301/862-0989).

DOWN TO EARTH -- Sweets for the sweet, roots for the roots . . . Little Red & the Renegades perform at an Earth Day 1991 benefit dance alongside info booths for the Sierra Club, Urban Earth, Anacostia Watershed Society, etc. Not surprisingly, this is a smoke-free occasion at the Cherry Hill Road clubhouse, one mile west of Route 1 in College Park ($10 or $15 with 7:30 dance lesson; 703/960-0667).

SUNDAY

TINSLEY TOWN -- Blues-guitar speedster Tinsley Ellis, who plays like Stevie Ray scorched by JB's Famous Flames, jolts the 8 X 10 ($5; 301/525-2000). Ellis has respect, too: His Heartfixers, once Atlanta's hottest band, used to back Nappy Brown.

MONDAY

TRIPLE DELIGHT -- An under-advertised and bargain-priced triple bill at the Birchmere ($8.50; 202/432-0200) combines the pearly-Steeleye voice of June Tabor and the Oyster Band, the Jody Grind and the iconoclastic and intelligent JudyBats.

BLOW IT, BEAU -- Harmonica bluesman Chicago Beau, accompanied by local stalwart Bobby Parker, plays the harp-felt blues at the Nyumburu Cultural Center (3125 South Campus Dining Hall) at U-Md.'s College Park campus ($5; 301/369-6781).

WEDNESDAY

GIMME GUITAR SHELTER -- Three of the area's guitar heroes, Pete Kennedy, Michael Fath and Annapolis luthier Paul Reed Smith, perform at the Hard Rock Cafe in a benefit for the nonprofit Shelter Project ($6; 202/432-0200 or at the door, space permitting). Fath also plays a rare acoustic concert (part solo, part trio) Thursday at the Barns of Wolf Trap ($10, 703/938-2404 or 202/432/0200), showing off all his paces -- classical, Latin, bluegrass and folk

THURSDAY

EARTH MOTHERS 2 -- Another Earth Day benefit: expatriate caba-ravers Betty and the Oxymorons at Opera ($15 advance, $20 at door; 202/678-6363).

PRETTY AS A PICTURE -- Not only is Paul not dead, neither is pretty-boy pop: The soft-focus Rembrandts play their hit and more at 9:30 ($9, 202/393-0930).