An idea gleaned from another website is to compile a list of songs, songs that require/utilise certain techniques that improve your overall ability as a musician. One option is to check out Justin or Marty but you can DIY if the song needs it.
Anyone care to get the ball rolling. Include the technique(s) required for your nominated song and other relevant information such as artist and album.
Insanity: doing the same thing over and over again and expecting different results. [Albert Einstein]