How to get music scrolls?

I'd like to get more music scrolls (preferrably the WC or Wysteria music scrolls), but I'm not sure how. The only one I have is for Mooshu. How do you go about getting more of the music scrolls?

Let me know!

I have NO idea but i heared people talking about farming for it and stuff

Music Player - bought in WC Music Store

WC Main Theme - bought in WC music store
KT Main Theme- bought in WC Music store
KT Theme 4 - Dropped bt Krokopatra
MB Main Theme - Dropped by Meowiarty
MS Main Theme - Dropped by Jade Oni
MS Combat Theme - Dropped by Oyotomi
MS Plague Theme - Dropped by Kirin Hoard Pack
MS Haunted Theme - Dropped by Kirin Hoard Pack
DS Main Theme - Dropped by Malistaire
GH Main Theme - Dropped by 4 ravens
CL Main Theme - Dropped by Mithraya
WT Main Theme - Dropped by 4 brothers
WS Main Theme - Dropped by Lord Bramble
ZF Main Theme -Dropped by Tse-Tse Snakeyes in ML

I have personally collected all of these, so the info is accurate, and I hope this helps!

and where is these so called store o_o