Actually, if you were a tenor (or even a baritone) singing from a piece of *solo* sheet music, it's one of those supposedly "understood" things that you will read treble clef, and it sounds (in your voice) an octave lower than if you played it on the piano as written. (*Sometimes* baritone/bass stuff will be written in bass clef, but often it will be in treble clef).
Please do not stick forks in your eyes, as this is a technicality issue regarding music notation for performance practice.
Sorry I can't answer you about the piano part, though.
"You are only young once, but you can stay immature indefinitely." - Ogden Nash