If you can be patient a bit longer, chords and scales are planned for a coming android update.
http://www.irealb.com/forums/showthr...es-or-keyboard
For visual readability, most any tablet would best the 5c/s.
I use a 2nd-hand iPad (1) it's great, except it's like carrying around a surfboard. My opinion, the 7" android tablets or the iPad mini($$$) are the best compromise in readability and portability.
)BOB