【實用教育app】HFPad|最夯免費app-綠色工廠好玩App

The musicians indispensable assistant - will help you construct solos, transpose for different instruments, learn music theory, practise efficiently, look good on stage (possibly) .. and more!Scales, chords, modes, transposition, constructions and the rest - in all 21 keys.The Harmony Factory is the simplest and most comprehensive repository of music knowledge for your iPad.