There are 300 songs he can choose for the 1st song.
That leaves 299 songs he can choose for the 2nd song.
That leaves 298 songs he can choose for the 3rd song.
That leaves 297 songs he can choose for the 4th song.
That leaves 296 songs he can choose for the 5th song.
That leaves 295 songs he can choose for the 6th song.
That leaves 294 songs he can choose for the 7th song.
That leaves 293 songs he can choose for the 8th song.
That leaves 292 songs he can choose for the 9th song.
That leaves 291 songs he can choose for the 10th song.
That leaves 290 songs he can choose for the 11th song.
That leaves 289 songs he can choose for the 12th song.

Answer: 300 POSITION 12 = 300P12 =  

300*299*298*297*296*295*294*293*292*291*290*289 =

425,270,752,192,695,317,567,218,560,000 ways,

more than the number of grains of sand on planet earth,
or more than the number of seconds it's been since the 
dinosaurs roamed the earth.

Edwin