When we were still in the middle of the Siamese Dream touring, I booked us into a local Chicago studio to just put all of our ideas down on tape, without censorship of opinions, etc. "Tonight" was one of those ideas, but it was originally in the key of C instead of G. The only problem was I couldn't sing it in C, so I figured out the version on Mellon Collie to suit my limited range.
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— Billy Corgan, "King Bs", Guitar World, January 1997