As I play bass in my band , I've got a friend who plays bass very well & is willing to give the guitar a go in my band ,he has a great voice & ear & just thinking how long it may take him to learn the parts never having played guitar before .we are doing stuff like The Stranglers , The Cure, The Killers , Boomtown Rats, & the keyboard player said he's willing to help out on the solo stuff ? just wondering if anyone else has swapped instruments in this way ?