The Six Strings App for iPad lets you strum an electric or acoustic guitar, banjo, mandolin, or ukulele, or play drum pads or a steel drum. You choose from a variety of chord settings for the stringed instruments or you can “play” individual strings – the strings even vibrate when you “strum” them. There are multiple settings for the drums, too. Except for the steel drum, all instruments are sized proportionally to the real ones. You can even record and save loops of your musical efforts. I bought this last night for $1.99. I have no idea how to play a real guitar, but I’ve had a lot of fun strumming away.