A few days ago began a discussion of the Temple choir and band. The Levites sang when certain offerings were brought and were accompanied by instruments. A mishna on today's daf enumerates some of the instruments: there were never fewer than two trumpets and their number could be increased to infinity; there were never fewer than nine lyres and their numbers could be increased to infinity; but there was only one cymbal. The g'mara clarifies that the limit on trumpets and lyres (each) is actually 120. It also asks about one cymbal since there is a proof-text about somebody striking them together; the answer is that since the pair of cymbals performs one function, it counts as one. (13a mishna, 13b g'mara)
A note in my edition of the text (Soncino) says that some editions omit the "to infinity" language in the mishna. (I'm not fluent enough to have an opinion on that word in the Hebrew.) The g'mara doesn't appear to address the concept; it just states a number (which is based on a proof-text about 120 priests sounding trumpets).
See comments for some interesting discussion and humorous commentary.