 Soon however, there were composers writing scores for (their own) bands that required professional to almost virtuosic skill to perform—some composers noting that any given march might be difficult to play "perfectly", that is, with all the correct expressions and articulations and with steady tempo.A grading system of difficulty of performance as adapted from Norman Smith's "March Music Notes" follows.A 'correct' general description of the original instrumentation of (American) march bands is unlikely, as these bands were extremely varied through the 19th and early 20th centuries and most march music was written by composers for their own bands.