LM A Cappella (LMAC) is an extracurricular activity at Lower Merion HS that allows students to participate in vocal music that does not fit in the traditional choral canon. The format of LMAC groups changes from year to year in an effort to give students a broad experience of different styles of music. It is intended to serve as an enrichment to the experience and instruction acquired in Concert Choir, but participation is open to all LMHS students. Depending on the format, an audition may be required for admission into LMAC in some years.