Trombone Quartet Bass Trombone - Level 4 - Digital Download SKU: A0.1203804 Composed by Ryan O'Leary. Chamber,Contemporary. 19 pages. Ryan O'Leary #802369. Published by Ryan O'Leary (A0.1203804). The mind is complex, and now there are very few moments where it isn't occupied by something. Technology and the monotony of day-to-day life eat away at our attention; this piece encapsulates what happens when there isn't anything to distract it.