I've been thinking about this for a while, so much so that I made a video highlighting the diferences between the "modern" and the "C418" era of Minecraft's music.

(I can't post the to the video but you can look up Extnt in YT :P)

C418 has lots of bangers, so I'll make it a top 5 in no order:

Dry Hands

Chris (not even in game haha)

Alpha (for those who ACTUALLY beat the game)

Aria Math

As for modern Lena Raine takes the lead, but theres a couple of Kumi Tanioka I really enjoy:

Creator (That guitar is DELICIOUS)

otherside

Infinite Amethyst

Comforting Memories

An Ordinary Day