ensure at least one pitch and one rhythm block in matrix
ensure at least one pitch and one rhythm block in matrix

hemantkasat/musicblocks,pikurasa/musicblocks,khandelwalYash/musicblocks-1,Kachachan/musicblocks,sneh1234/musicblocks,tradzik/musicblocks,hemantkasat/musicblocks,pikurasa/musicblocks,sneh1234/musicblocks,Kachachan/musicblocks,hemantkasat/musicblocks,tradzik/musicblocks,tradzik/musicblocks,khandelwalYash/musicblocks-1,sneh1234/musicblocks,khandelwalYash/musicblocks-1,pikurasa/musicblocks,Kachachan/musicblocks