Tornrak is scored for strings, flute, piccolo, oboe, (doubling cor anglais,) 2 clarinets, (doubling E flat clarinets,) bassoon (doubling contra bassoon,) 2 horns, trumpet, trombone, tuba, piano, vibraphone and separate percussionist.
On the non-musical level, too, Tornrak develops ideas seen in the composer's earlier works.