Led by Stan Kenton alumnus Glen Roberts and made up largely of WWII-era veteran musicians (their trombonist played on Bing Crosby's original recording of “White Christmas”), the 17-piece swing troupe Glen Roberts Big Band always offer an astonishing earful. Performing a free show Wednesdays at 7 p.m. at Viva Cantina, their choice of material is outstanding, they feature complex, dynamic arrangements, they have a great “girl singer” and, despite their advanced age, they have remarkable energy. The gigs are as dreamy as their (quite true) origin story: Almost 10 years ago they drifted into the Mexican restaurant unannounced, set up guerrilla-style and just started playing. No joke. 900 W. Riverside Drive, Burbank. (818) 845-2425,. —Jonny Whiteside

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