That is exactly what I wrote, BB is NOT a notation program. MuseScore or any other similar notation program does not deliver an app for iPad nor for Androïd systems. If you're familiar with iReal B Pro then that's an app with thousands of songs that can be selected and "transposed" instantly on the spot. However it uses only chords. Any musician I know uses it. It's available at iPad and for Androïd.

BB has also thousands of songs available. They could be very competitive if the BB app had the possibility to import their format more easily and transpose it as well. Transposing on the spot (gig) is the most imported wish.

And doïng this with "fake notated music" (music notes as used in BB and which can be printed to pdf) is the most wished next possibility.
The notation possibility of BB although limited is exactly what is suited for this purpose.

Musicians and music publishers are still wasting too much paper...come on men we live in the digitised age...Wake up!