Experimental Moroccan-jazz-groove collective Club d’elf (pictured) celebrates its heady new double-CD release Live at Helsinki with an early show at Berklee’s Club 939 that features guitarists Randy Roos and slide virtuoso Dave Tronzo joining bassist-leader Mike Rivard’s rotating cast. Also on Friday, a tribute to the Allman Brothers’ Butch Trucks seems likely when Greensky Bluegrass merges the worlds of string music and jam bands at House of Blues. Scottish post-rockers Mogwai give live accompaniment to Mark Cousins’ documentary film Atomic at the Berklee Performance Center the same night, while Wisconsin indie-rockers Phox return to Brighton Music Hall before an indefinite hiatus and singer/guitarist Denny Laine dips into his old Moody Blues and Wings catalog at Arlington’s Regent Theatre.

Charismatic soul singer Bettye Lavette interprets a wide repertoire in the intimate spaces of Fall River’s Narrows Center for the Arts on Friday and Rockport’s Shalin Liu Performance Center on Saturday. On Saturday, World Music/CRASHarts also presents its international bash CRASHfest with Toureg guitarist Bombino, indie-rockers San Fermin (collaborating the NOW Ensemble), the Latin music outfit Orkestra Mendoza, local Ethiopian outfit Debo Band and five other acts on three stages at House of Blues. And the night’s big show is the Last Waltz 40 tour, with Warren Haynes, Michael McDonald, John Medeski and several other all-stars paying tribute to the Band’s 1976 farewell concert. Here’s a jump as well to my interview with Last Waltz tour bassist Don Was. The Old 97’s frontman Rhett Miller also performs at Somerville’s Once Ballroom on Saturday, while Sunday brings the Danish pop-soul upstart Lukas Graham to House of Blues.