My theory of "what music is" is described here in the too-long and too-short versions respectively: https://dl.dropboxusercontent.com/u/3507527/MusicTh.html https://dl.dropboxusercontent.com/u/3507527/MusicThShort.html Re furthering the understanding of that whole question, it might be interesting to know which OEIS sequences sound the best & worst when converted to music. (And I do not know the method you use to convert them to music. Presumably many conversion methods are possible.) If you had a music-quality-rating for each, generated by OEIS users, then eventually we'd know that. (It also is possible some people might like while others dislike some music, e.g. the whole distribution of ratings on an 0-9 scale might be good to keep, not just its mean.)