Hotaru Koi ( Come, Firefly, Come ) Young String Series - Full Score, Beginning Level. This series has four different performance levels to provide you with a highly focuses repertoire for your orchestra & string orchestra. Each level has been carefully designed and graded within specific guidelines, Instruments include: Violin 1, Violin 2, Violin 3 ( Viola T.C. ) Viola, Cello, Bass and Piano.