The Acting Singers Project has allowed four groups to use their 501(c)3
status while those groups worked to achieve their tax exemption:   

1.  Mass Theatrica achieved 501(c)3 status. 
2.  Boston Metro Opera, no longer exists.   
3.  The Halcyon Music Festival achieved 501(c)3 status.  
4.  Roslindale Farmer's Market has also achieved 501(c)3 status.