Critic's picks

EITHER/ORCHESTRA

For more than two decades, the eclectic Boston-based "little big band," led by saxophonist/composer Russ Gershon, has explored the world both musically and as a touring unit. In the process, they have become among the finest exponents of Ethiopian jazz, among other accomplishments. This show will debut several new compositions, including numbers slated for E/O's forthcoming 11th album. 7:30 p.m. May 1. $16. Regattabar. 617-395-7757, www.regattabarjazz.com KEVIN LOWENTHAL

GAVIN ROSSDALE

Gwen Stefani's hubby and former Bush frontman does the solo thing, offering friendly grunge in an attractive package. 9 p.m. May 1. $25. Paradise Rock Club. 877-598-8689, www.livenation.com SARAH RODMAN

BERN NIX/DAVE BRYANT QUARTET

Guitarist Nix and keyboardist Bryant were key members of Ornette Coleman's electric (in both senses of the word) Prime Time band. Adventurous, lyrical, and challenging jazz in the mold of the master, with local stalwarts bassist John Turner and drummer Eric Rosenthal. 8 p.m. May 2. $10. Outpost 186 (186 1/2 Hampshire St., Cambridge). 617-876-0860, www.zeitgeist-outpost.org K.L.

OPETH

Swedish death metal at its finest: technically accomplished, musically varied, and totally ferocious. 8 p.m. May 2. $22. House of Blues. 877-598-8689, www.livenation.com S.R.