I was watching the Macabeats D'ror Yikra where they use cups as instruments to keep the beat and enhance the way the song sounds. Obviously this was not filmed on Shabbos (Duh!) but I was curious if there were any aspects of the way they sing the song and keep time and enhance the sound with their hands and cups that would be forbidden to do on Shabbos.
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The Mishna in Beitza 5:2 teaches that one may not clap their hands or slap their thigh, lest they come to make or fix instruments (Rashi to Beitza 36a - keeping the beat this way will lead to simcha and song [which will lead to music and instruments]).
The Shulchan Aruch O.C. 339:3 extends this to banging with nuts, meaning even beyond musical instruments.
The Rama there cites Tos. in Beitza 30a who says that today we don't know how to fix instruments, so the concern does not apply. The Mishna Berura 339:10 says not to rely on this.
Rabbi Daniel Mann discusses this question and concludes that it is better not to use cups as instruments, however there are are those that would permit it.