My first audition was a joke. They gave me a tape, I had a week so I went to see my brother and he helped me more or less learn the outline of all the songs.
Got there and they said that the tape was just a guide to the sort of music they were into. Two guitarists who didn't have any songs written but just vaguely jammed at random and seemed surprised that I didn't have clue what they were doing.
Really dented my confidence, but in retrospect I realise they were the clueless ones, even if they could play a lot better than me.
Next band were the opposite, gave me a few straightforward songs, I turned up, I wasn't perfect but they enjoyed it and that was it.
Other two bands, one I just fell into as I already knew some of them. The other we met up in a pub and exchanged tapes of bands we used to be in. The audition was the guitarist teaching me the Bruce Foxton-style basslines to all his songs on his guitar. As I (to my surprise) was the first person he found who could play them, I was in.
<edit> Our sound was very close to the Beautiful South, one of the few successful bands to be based around male/female vocal duettes.