String Trio Cello,Viola,Violin - Level 2 - Digital Download SKU: A0.1269449 Composed by Miriam Troxler. Chamber,Children,Instructional. 3 pages. Miriam Troxler #861956. Published by Miriam Troxler (A0.1269449). Lightning bugs and Fireflies is a D Sharp Minor round for string trio in 2/4 time. The bugs buzz along with judicious use of tremolo.  The violin and the viola parts double for smaller ensembles. An optional piano part is included for rehearsal convenience.