411 REFERENCE · Wikibooks
IB Music/Exam/SL Group Performance
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
The group performance can be anything, as long as it consists of a group performing. Your part does not have to be significant- even if you only play the triangle on measure 425, you may count that piece for you group performance. The piece must be from at least 2 separate concerts, and must be the same group.