Young musicians are invited to attend a free, open rehearsal of CSA Sinfonia on Jan. 30, CSA Symphonette on Feb. 12, and CSA Children’s Choir on Feb. 13.

These Bring A Friend Days give interested players or singers a chance to try out the group to see if it is right for them. The rehearsals all take place in the Northern Illinois University Music Building. The ensembles are sponsored by the NIU Community School of the Arts.

CSA Sinfonia is for string, wind, brass and percussion players ages 14 to 20. Group plays original masterpieces as well as music from the 20th century. Rehearsal is 7:30 to 9:30 p.m. Wednesdays.