Import MP3 / WAV to MPC Beats

How can I import a song (in mp3, wav or any form) to MPC Beats? I wanna play over it

Drag the file over and drop it into your project. Then when it appears in the Samples browser window, drag and drop it onto an empty audio track. Then either warp the file to match the project BPM or change the project BPM to match the audio file. Then have at it.

You don't want to import mp3 files to the mpc because this is illegal.