"MS Songbook" misses crucial options as useful reader.
The great advantage of the "MS Songbook" app as reader is that you can transpose imported music. Especially for lead sheets (fake books) this is an optimal feature since you can search download and transpose on the spot. However there are several shortcomings:
1. An "octave changer" is needed for several transpositions.
2. Transpose should (default) be done with single sharps and flats.
3. A PDF export possibility to be able to use the benifits from readers like forScore/MobileSheets.
4. It should except an AirTurn Ped or alike.
5. Files should be importable by iTunes (iPad) or directory's (Androïd).
6. "Discover" searching should show A-Z order (at least optional).