how do i get music on external SD card

[TomKemper]

When i copy my music to SD Disc - and do a RESTART most if it disappears

[Snn5]

I might try another SD Card.  Sounds like maybe it isn't reading and writing correctly.  If not that, then perhaps the phone has an issue.  Might even try a different method of transfer, IE, WMP or drag and drop, or another media program.