Try using VLC media player. Open it and then go to "Media" -- Convert\Save -- press "Add" then find your music -- then press "Convert\Save" -- find "Audio - MP3" in the "Profile" -- then do the rest. Just wait for VLC to be done converting it. Hope I helped.
Yomuchan
You should refit them to around 44~48kbps (regular quality) or 64~102kbps (great quality) using audacity. For some reason, some youtube downloaders get MP3s that use a Variable Bit Rate that plays havoc with Flash 8.
Shoot a PM my way if you need moar help.