In Midi Pad you can play midi for fun or create simple drafts and save to midi files for later editing in some other software. (No editing is possible in this software.) You can play from a midi keyboard or play from a Qwerty computer keyboard. Sing or play and convert audio to midi in realtime with a microphone or from a wav file. The audio to midi convert function will work best with simple tunes with one voice or instrument, not a full band. (And you will most likely need to edit the result later.) Save result to a midifile. There is also an option to turn on visual effects while singing or playing into a microphone.

(There is also a free version called “Midi Pad Light Version - Midi Player and Audio Converter”. The light version lacks the full realtime converter with saving options and visual effects.)