Fri. The eighth annual All Good Summer Festival and Camp Out at Marvin's Mountaintop in Masontown, W.Va., offers three days of music and other activities. It's a bit of a drive but the lineup is a good one. Friday features Keller Williams, the Greyboy Allstars, Stockholm Syndrome, Steve Kimock Band, Deep Fried, Reid Genauer & the Assembly of Dust, Ozric Tentacles and Theresa Andersson. On Saturday, look for the Disco Biscuits, Medeski Martin & Wood, Leftover Salmon (with David Lowery and Johnny Hickman of Cracker), Burning Spear, Ekoostik Hookah, Soulive, Umphrey's McGee, Jazz Mandolin Project, the Hackensaw Boys, the Bridge and Libby Kirkpatrick. The festival closes out on Sunday with Dark Star Orchestra, North Mississippi Allstars, Del McCoury Band and the Campbell Brothers. Tickets are available through Ticketmaster (703-573-7328). For more info, visit . . . It's yin and yang as the smooth grooves of Congregation open for the blues-rap influenced, hard-rockin' bluster of Tony C & the Truth at the Black Cat (202-667-7960). . . . Jazz-groove band Down to the Bone from Britain heats things up at the Birchmere (703-549-7500). . . . Sting and the wonderful Annie Lennox (see the Spotlight on Page 6) are at Nissan Pavilion (703-573-7328).

Sat. "Zimbabwe's Lion" Thomas Mapfumo is at Kili's Kafe (202-232-1562). Mapfumo is a prominent figure on the African music scene with a style that is rooted in traditional Shona mbira music but uses modern instrumentation. . . . The New York female rap crew Northern State and master turntablists X-Ecutioners are at the 9:30 club (202-393-0930). . . . Uncle Kracker knows a bit about turntables having broken through as Kid Rock's DJ. In his solo career though, he has been less about the rap-rock ballistics and more about the country-rock croon. He's on the road with country (and a little pop) singer Kenny Chesney, who's giving Jimmy Buffett competition for musical icon of Beach Loving Nation, and country group Rascal Flatts, known for its harmonies and member Joe Don Rooney's derriere, which was shown off in the group's "I Melt" video. The tour rolls into Merriweather Post Pavilion (410-547-7328). And if you can't see them there, you have another chance on Aug. 13, when they're scheduled to play at Nissan Pavilion (703-573-7328). . . . It's pure country bluegrass when Hayseed Dixie plays at the State Theatre (703-237-0300), well, pure except for the fact the group is playing songs by AC/DC and Kiss. . . . The weekly Live on Penn concert series returns for a summer run. Starting things off this week are Eve 6, the excellent Old 97s, Practically Einstein and the Speaks.

Sun. Some rappers who helped lead the way when the genre was still young are at the Recher Theatre (410-337-7178). Doug E. Fresh, Biz Markie and "The Ruler" Slick Rick have all recorded classic tracks and deserve much respect. . . . Literate singer-songwriter Shawn Colvin and the mood-conjuring Cowboy Junkies are at Wolf Trap (703-218-6500).

Thurs. The Gay Men's Chorus of Washington is joined by the London Gay Men's Chorus and the Heartland Men's Chorus from Kansas City, Mo., at Lisner Auditorium (301-808-6900) for a joint concert. The London chorus, which has a wide array of songs in its repertoire ranging from contemporary to traditional, is also doing a July 16 show at Kennedy Center Millennium Stage (202-467-4600).

-- Curt Fields