I can play the piano reasonably, let's say I am able to play the pianopart of Schubert's Erlkonig.
Now comes the difficult part, I don't know if I have the proper voice for singing to begin with. Let's get a few vocal lessons first, but...
how difficult would it be to sing the voice part as well to an acceptable level? This song is probably too difficult to begin with. Most definitely. 'Auf der Bruck' D853 is another song I would like to sing as well, only one player involved there.
I was just wondering to what level this would be possible, perhaps you would have to excel on both levels; an extreme version of multitasking this would be. I will undertake Liszt's version later on in case I have a sore throat

(just kidding).