I cannot find the music that I transferred into my player
The song might be in a format that is not supported by the player. Only MP3, WMA and WAV files are supported.
The audio file might be corrupted, try to playback the file on your PC first, If it does not play, RIP the song again·
When a WMA file has been protected within Windows Media Player, the files are then unable to be copied and sent to the player . This will cause the files to be seen within Windows Media Player library, but will not appear or playback within the Digital Audio Player . When ripping your music from CD please always make sure that the “Copy-protected music” option at Tools->Options under the Rip Music is unchecked.
You may have transferred the file using Windows Explorer to the Data folder. Tracks transferred through Windows Explorer will not be viewable/playable on the device. Transfer your music to the Media folder instead.
Some of those music tracks may be in a format or bit rate that is not supported by the player like AAC or files in variable bit rate may be skipped by the player. (For MP3 the player supports 32 –320kbps & for WMA: 5-192kbps with sampling rate 8.0kHz up to 44.1kHz)