Although the Aires usually have about sixteen members, group numbers vary on a term-to-term basis. Auditions are held at the beginning of every fall term. Members of the Aires pick what songs to arrange based on the group's tastes. Because the Aires are such a diverse group, they end up singing a lot of different styles. Currently, much of their repertoire consists of popular songs from the 1980s, 90s, and 00s, but it also includes many traditional Dartmouth songs, a few 1950s and 1960s tunes, selected hip hop tracks, and the occasional musical theater piece.