 For a performance score, however, the notes have to be readable from a music stand and the editor has to avoid excessive page turns and ensure that any page turns are placed after a rest or pause (if possible).As well, a score or part in a thick bound book will not stay open, so a performance score or part needs to be in a thinner binding or use a binding format which will lay open on a music stand.In classical music, authoritative musical information about a piece can be gained by studying the written sketches and early versions of compositions that the composer might have retained, as well as the final autograph score and personal markings on proofs and printed scores.