B-Flat Trumpet,Piano - Level 2 - Digital Download SKU: A0.1230620 Composed by Brian Dong Ho Lee, Hong Jun Park, Jeong Hun Seo, and Rebecca Rose Johnson. Arranged by Kaiserin Rebecca. 21st Century,Contemporary,Disco,Pop. Score and part. 6 pages. Kaiserin Rebecca #826330. Published by Kaiserin Rebecca (A0.1230620). Don't Know What to Do by Blackpink. For B-flat trumpet solo and piano accompaniment with chords.Key: B flat major. Duration: 1'55.