The SONGWRITING TRANSPOSER works in 2 ways: (#1) It shows multiple chord combinations to write songs quickly. No complicated instructions. Simply slide to the key you want and just like magic, all the chords fit together to make a song. You can use any combination of chords in the window in any order you choose. It opens up a whole new world of songwriting options. (#2) Use it to transpose to different keys. It's so easy, just slide and substitute.