Free and official high quality Nintendo music
http://static.wixstatic.com/media/bd1b27_89de4298c4fc4b59b2d1e1ce93da6ca6.png_srz_p_ 262_262_75_22_0.50_1.20_0.00_png_srz
Super Mario Galaxy Original Soundtrack Platinum Version
Realease date: January 2008
Publisher: Nintendo (Club Nintendo)
Composed by: Mahito Yokota, Koji Kondo
Size: 738M
Format: M4A converted from FLAC (Lossless)
http://static.wixstatic.com/media/bd1b27_379777fe6ce54741a1980c6b4c584bc3.png_srz_p_ 216_130_75_22_0.50_1.20_0.00_png_srz (http://nintendosoundtrack.wix.com/nintendo-soundtrack#!super-mario-galaxy-original-soundtrack/czum)
Why 320K ? Just convert to V0 (VBR 0) since it have the same quality and is smaller
Anything is ok, would recommend to use Dbpoweramp or Foobar tho