Here is another marker sketch I made recently, with the self-imposed obligation of no preparatory drawings and absolutely no chance to correct or eraze anything at all. I'm quite happy with how it turned out in spite of this.

I always found it odd that in spite of her cutie mark we never saw her with a lyre or doing anything musical at all in the series (though there is an official comic in which she is shown to throw a lyre at a changeling). I also regret that, in spite of her being recognized as one of Twilight's early friends in Canterlot she was not present at the meeting of the other "Canterlot Six". I messed up the treble clef (accidentally drawing it mirorred) the notes are from the begining of "If we hold on together", the main melody of the land before time.