Justin ZamarripaJustin Timberlake has been away from music for a while. It’s been six and a half years since the release of his last album, the excellent and widely popular FutureSex/LoveSounds. Thus, Timberlake can be forgiven for trying to pack his follow-up, The 20/20 Experience, with as much music as possible. The ten tracks on The 20/20 Experience average seven minutes in length. While some of the songs are better suited to such extension, others sound…