Full instructions on how to create your very own Arduino music player and alarm clock have been kindly published by Dejan Nedelkovski with all the code you require.

I just received my RC522 RFID reader and made this simple Arduino access control system that uses the reader, a buzzer for the alarm and a relay shield for the security system. The relay can be used ...

If you want to give people more options without forcing a playlist, Instructables user LifegraphLabs shows off a system that uses RFID, an Arduino, and Facebook to play everyone's favorites songs.