Let's say RockSchool for now to keep it simple.
I'm aware that it's a bit more flexable than the grading scheme on piano, and I'm applying to a music college this year and looking at my options for songs to play for the audition.
I want to perhaps play Over The Hills and Far Away by Led Zeppelin, and perhaps this question could use some rephrasing, but bonus points for giving a rough estimate of the over the hills grade(I reckon 8 for the solo)
What are the main factors influencing a graded piece