The Crosbys usually perform in jeans and blazers; their alumni song — a collegiate a cappella tradition in which alumni present at the concert may join current members to sing — is "Strike Up the Band" (aka Jack). They undertake a two-week tour each winter, succeeded by The Jam, a large performance at the end of each semester.
The Crosbys are known for their attire: jeans and blazers. Their alumni song, a collegiate a cappella tradition where alumni can join current members to sing "Strike Up the Band" (aka Jack), is performed during winter tours that last two weeks. The Jam, a large performance at the end of each semester, follows these tours.