Verified answer

It means:

"Did you try singing?"

歌ってみたのか？

utatte mita no ka?

utatte miru = to try singing

utau = to sing

Cheers!

歌ってみたutatte mita - tried to sing

no ka - indicates confirming in a question form

therefore, the whole phrase could mean: Oh i see, so subj. did try to sing?

i think it means "i sing?"