GreenLight Jazz Orchestra is a 1920's Hot Jazz Orchestra & New Music Ensemble founded by Boston-based composer Warren Ertle. The ensemble plays early jazz standards from the 1920's and 30's, arrangements of pop tunes, as well as new music that draws influence from early jazz and modern pop music styles. The ensemble began from a group of 2019 Boston Conservatory at Berklee graduates in the spring of 2019. GLJO's roster is comprised of conservatory graduates, members of the 215th Army Band (Fall River, MA), and talented jazz musicians from all over the Greater Boston Area.