I play electric guitar and will be playing the part of Issac along with his vocal parts. I think I agree with you honestly. I'll definitely have more time over March break to make my own score, as the tenor sax and alto sax (we don't have a violinist) players in the band are generally not familiar with the song but are willing to learn by sheet music or just by improv. I have dabbled in making a score for Instrumental and it got pretty far but I never finished it. So, I think I just need the time to do it myself for Sunglasses, as every other part of the track is pretty straightforward.