There seems to be an abundance of Lemmings ports and various releases for the PC, but I haven't been able to find this particular version anywhere. Unfortunately for me, it happens to be the one I grew up with.
It contains the original "Lemmings" (DMA Design; Psygnosis) bundled with the add-on "Oh No! More Lemmings" and some demos for other games in the series, if I remember correctly. The game itself seems to be nearly identical to the original DOS version, save for the higher quality music (the music is primarily the reason I am requesting this).
Here's a gameplay video of this particular version and its music -
https://www.youtube.com/watch?v=S7xXoVwdRo0