The 7 PM concert promises audiences the chance to hear covers and original songs by the cast of Once, all of whom play instruments in the Tony-winning musical.

Scheduled to perform are David Abeles, Will Connolly, Elizabeth A. Davis, David Patrick Kelly, Anne L. Nathan, Lucas Papaelias, Rob Preuss, Andy Taylor, Erikka Walsh, Paul Whitty and J. Michael Zygo.

Ars Nova's 54/10 Music Marathon runs through Aug. 11 and showcases up-and-coming/underground musical talents.

Tickets are $150 (open bar and reserved seating) or $250 (open bar, priority seating and VIP afterparty with the artists), and are available at arsnovanyc.com or by calling (212) 489-9800.