I remember June singing 'Africa's Burning Sand' at, possibly, the Enterprise one hot and extremely close summer evening way back in the mid '70s. She'd just finished a very melodramatic line when there was a room-shaking crash of thunder and lightning outside that must have lasted ten seconds or so. There was a stunned silence for several seconds more, at which point she took a deep bow before continuing with the song.

So, because I remember that one the best, it's my choice.

And June was, indeed, a librarian back then.