The Avalon String Quartet performs on the Cedille recording available here:
https://www.cedillerecords.org/albums/leo-sowerby-the-paul-whiteman-commissions-other-early-works/
Classics Today calls it a “delightful, even astonishing release….Sowerby’s First String Quartet is a substantial work in three movements. The idiom is self-consciously “American,” full of modal, folk-like themes and zesty rhythms. Although the movements get longer as the work progresses, the music becomes increasingly lively and the entire structure, however unconventional, works extremely well… The two additional works, Tramping Tune for quartet, piano and double bass, and the charmingly lyrical serenade for string quartet, round out this compelling and beautifully assembled collection. Truly a major discovery.”