
If you have questions about the conjugation of концертино or Russian nouns in general, you can practice and get feedback from a professional tutor.
Научимся играть на концертино.
Learn to play the concertina.
на рояле, на скрипке, на ксилофоне, на пиле, на концертино, на аккордеоне...
Just remember I've played seven instruments... the piano, the violin, the xylophone, the musical saw, the concertina... - the accordion...