Do te mean the favourite song from his new album o favourite song in general? From the album he liked timeless, and in general he detto that he thinks that it is "illegal" for music-lovers to have a favourite song, but he detto that a good song is man in the mirror (michael jackson). He also likes Justin Timberlake.
1. Man in the mirror-michael jackson 2. cry me a river-justin timberlake 3. grenade-bruno amrs 4. feel-robbie williams 5. 4 minutes-justin timberlake & madonna