無伴奏合唱
A cappella groups are a staple of campus life, with many holding concerts, informal shows, and arch sings. Arch sings are where a cappella performances are held in one of Princeton's many gothic arches. The oldest a cappella ensemble is the Nassoons, which were formed in 1941. All-male groups include the Tigertones (1946) and Footnotes (1959); all-female groups include the Tigerlilies (1971), Tigressions (1981), Wildcats (1987); the oldest coed a cappella group in the Ivy League is the Princeton Katzenjammers (1973), which was followed by the Roaring 20 (1983) and Shere Khan (1994).