Not too many iPhone apps I can recommend as truly useful, but one I like very much is this: Guitar Toolkit It does all it says it will do, and does it well. Tuner, metronome, scales and chord charts for standard and many alternate tunings, for 6-, 7- and 12-string guitar, 4-, 5- and 6-string bass, ukulele, banjo, mandolin. Costs about $10 from the app store. Not a good enough reason to buy and use an iPhone or iPad, but if you already have one of those costly gadgets it comes in very handy.
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