Check the properties on each file, (right click over the file), when properties window opens, check the right hand tab and choose advanced, there you can check that all the artists names are written correctly or at least the same, that way sansa will group them under the same artist. In that place you can change track #, album etc, to group your music as you like. Be careful, this has to be done in the pc before transfering them to the sansa, after changes are made, click on apply and done and then you transfer them to your sansa.