Fri.Fred Yonnet is a jazz wizard on the harmonica. Let him prove it to you when he and his band get grooving at the Borders (202-466-4999) at 18th and L streets NW. . . . Young pop-country singer Katy Benko is well known in this area, having spent her teen years performing throughout the region. She has a CD coming out this month with some intriguing new material, and she's showcasing it at Jammin' Java (703-255-1566). . . . Breakbeat DJ Hyper is scheduled to appear at Vision at Up! Nightclub (202-737-0551) in support of his new CD "Bedrock Breaks: Fractured." He'll also be at Trust (410-659-9500) in Baltimore on May 3.

Sat.A personal fave of mine, Chris Whitley, will be at Fletcher's (410-558-1889) in Baltimore along with Johnny Society. Whitley has lately been exploring a more acoustic vein of music, but in the past he's ventured into blues electronica and countryish ballads. Thanks to his talent and passion he never sounds as if he's just dabbling. Whitley and Johnny Society will also be appearing at IOTA (703-522-8340) on Sunday.

Sun.It's the somewhat experimental, generally slow-tempo rock of the Dirty Three at the Black Cat (202-667-7960). The group's influences are obviously eclectic, and they're more than willing to engage in onstage improvisation when the mood strikes.

Mon.New Orleans's Jai Alai uses melody and subtle electronics to establish a mood. Get in it at Galaxy Hut (703-525-8646). . . . Rosanne Cash sings beautiful, intelligent songs. Sometimes they're rich and complex, other times they're hauntingly simple, but they're always well done. Cash is in the area for two nights, first at the Rams Head Tavern (410-268-5111) in Annapolis and then on Tuesday at the Birchmere (703-549-7500).

Tues.Annie Lennox has an extraordinary voice and mesmerizing stage presence. She will be singing at the National Theatre (202-628-6161).

Thurs.Savina Yannatou and her group Primavera en Salonica will be performing traditional songs from several countries, including Greece, Spain and Lebanon, on the Kennedy Center's Millennium Stage (202-467-4600). She sings in a variety of languages, and her polished vocals and modern take on the material can be enchanting at times. . . . The Once Twice Festival begins in Baltimore. It runs through April 19 and will feature performances and video by more than a dozen local, national and international electronic musicians. The first night focuses on minimalists, with subsequent nights concentrating on techno/house hybrids and audio-video duos. The event takes place at Johns Hopkins University and at the club Sonar. Visit www.oncetwicesound.com/festival for more info and directions.

-- Curt Fields