Okay, we needed more than that one word. But, the group shouts “Yahoo!” quite a few times in the song. Think “Huge Dance Hit from 1980”. It stayed at # 1 on the Billboard Hot 100 for two weeks in February 1981. One more hint; the following are a few of the only lines that don’t contain some form of the single word title:
It’s time to come together It’s up to you What’s your pleasure?
Should have known that one from the one-word clue.
It's Celebration, by Kool & The Gang.
OK, this is from 1973:
All over the country, I've seen it the same Nobody's winning at this kind of game We've got to do better; it's time to begin You know all the answers must come from within