Just to add to Q's comment "What you are asking for, an accurate, comprehensive listing, would require research on a large scale if 20th century music after ca. 1910 (1923 is no longer a valid cut-off for some renewed material) is involved. " I might add that even 1910 is not a reliable cut of point here in UK. Copyright is held by the composer(or his asignees) for life(of the composer)+ 70 years. A song may have been written in 1900 by a fifteen year old who died in 1970. Copyright will remain with his estate or his asignees until 2040.

Nigel