Currently Being ModeratedJan 24, 2013 4:20 PM (in response to KeithGra)
Upload all your music to iTunes Match. Now that all your music is in iCloud iTunes Match service. You can now delete all your current music on your computer. Now download all the music from the iCloud and your music will be 256k. That is for PC or Mac.
On your iPhone, as soon as you download the music to your iPhone. The songs will be 256k.
Currently Being ModeratedJan 25, 2013 5:32 AM (in response to KeithGra)
Bruce is not entirely accurate. Any songs that were not "matched" will be "uploaded" and will not be upgraded to the iTunes Store version.