Rick's difficulty remembering his own songs brings up a fact that has always puzzled me. That is the discrepency between the lyrics sung on an album and the printed lyrics enclosed with the album. Sometimes it's just a word, but sometimes it is whole lines. Often the singer who is singing one set of words is the writer who wrote the other set. This cannot be attributed to a quick ad lib as the verses are galloping through the mind at a different speed from the song, because these are invariably studio recordings with multiple takes and ample time to get the two sets of lyrics in agreement.