Violin Solo - Level 2 - Digital Download SKU: A0.603730 By Katy Perry. By Bonnie McKee, Dr. Luke, Henry Walter, Katy Perry, Lukasz Gottwald, and Max Martin. Arranged by Kevin Busse. Pop. 3 pages. Kevin Busse #3874923. Published by Kevin Busse (A0.603730). This is an exact transcription of Katy Perry's Roar in a good range for Violin.