A group of 3, musically
like, two is a duet ... [PAR] May 23, 2012 ... Tom Petty & Stevie Nicks/Stop Draggin my heart around Linda Ronstadt and 
Aaron Neville  When Something is Wrong With My Baby, and... [DOC] [TLE] Glossary of Musical Terms - Classical Works [PAR] Chord -, 3 or 4 notes played simultaneously in harmony.