There's this wonderful android app called perfect ear: https://play.google.com/store/apps/details?id=com.evilduck.musiciankit https://play.google.com/store/app

There's this wonderful android app called perfect ear: https://play.google.com/store/apps/details?id=com.evilduck.musiciankit https://play.google.com/store/apps/details?id=com.evilduck.m... It has interactive exercises and singing practice