cantomaniacal 

a recent coinage, meaning, literally, " crazy about singing..."

The vocal music major described herself as cantomaniacal.

cantomaniacal by niles lishness June 13, 2007

cantomaniac  

one who is given to excessive singing; one who sings at the drop of a hat; one for whom song is a predominant form of self-expression.

My friend, Julie, is a cantomaniac - every time I go to her house, I can hear her singing before I get to the door!

cantomaniac by Lynn K. Edisen January 23, 2009