Equip Caraboose fairy Familiar Shard (if you don't have it just kill lots of Caraboose pink fairies until you get it) and go to the piano area in Garden of Silence. Sit at the chair in front of the piano and wait for a moment. Miriam will start playing the piano and Caraboose Familiar will start singing alongside her. Once the song is finished you will get the Recital achievement.