''When we were making our third record, the War LP, we were being thrown out of the studio by the studio manager because we had overrun or something and we had one more song to do. We wrote this song in about ten minutes, we recorded it in about ten minutes, we mixed it in about ten minutes and we played it, then, for another ten minutes and that's nothing to do with why it's called '40'.''
did you know
A local violinist, Steve Wickham, approached The Edge one morning at a bus stop and asked if U2 had any need for a violin on their next album (the War album). In the studio for only half a day, Wickham's electric violin became the final instrumental contribution to Sunday Bloody Sunday.