Surroundsound Rock

Summon a barrier within a 100ft area that blocks physical attacks and magic spells. Roll a performance check to determine the strength of the barrier. Depending on how high you roll, it can block certain levels of spells and below. You sing a rock song as you play a solo with with your instrument, making magic speakers surround the entire battlemap that aim towards you and play your solo to create a green see-through barrier made from the magic vibrations. The better your solo, the stronger the barrier. 

DC 1-4 blocks cantrips and level 1 spells
DC 5-9 blocks level 3 spells and below
DC 10-16 blocks level 4 and below
DC 17-18 blocks level 5 and below
DC 19-above blocks level 6 and below