Meirion Williams - Gwynfyd (E-flat)
Meirion Williams - Mai
Meirion Williams - Pan Ddaw'r Nos
Meirion Williams - Portreadau o Natur
Meirion Williams - Tri Darlun o'r Môr
Meirion Williams - Y Llyn
Meirion Wynn Jones - Beloved, let us love
Men of Harlech (Rhyfelgyrch Gwŷr Harlech)
Mentra Gwen
Merch Megan
Mervyn Burtch - Three simple string quartets
Mervyn Burtch Monograph
Mervyn Roberts – Ballad (for solo piano)
Mervyn Roberts – Four folksong studies (for solo piano)
Migildi Magildi - Welsh Folk Song, J. Lloyd Williams, L. D. Jones (Llew Tegid)
Miri Mebyd
Morfydd Owen - A Mother's Lullaby
Morfydd Owen - A Song of Sorrow
Morfydd Owen - April
Morfydd Owen - Away in a Manger (high voice and piano)
