PSP "Music Symbol" Button: It's the Note Button on PSP-1000 Only

The PSP has no button labeled with a music symbol on most models. The exception: the original PSP-1000 has a Note button (music note icon) on the lower left face. It launches the Music player from any screen.

PSP Button Layout Reference

• Face: Cross / Circle / Triangle / Square
• Shoulders: L / R
• System: Start / Select / Home (PS)
• Directional: D-Pad / Analog Stick
• Side/Top: Volume +/- / Hold / Brightness / Screen
• PSP-1000 only: Note button (music note) → opens Music app. On PSP-2000/3000/Go/Street, this became the Screen button (display toggle).

If you saw a music note button, it's a launch-model PSP-1000. Later models replaced it with Screen.