Holy cow! What else can be said about this guitar virtuoso, which has not already been said several times before? He's an accomplished guitarist whom, originally influenced by the likes of Jimi Hendrix, Eric Clapton, Jimmy Page, Ritchie Blackmore, Jeff Beck and Allan Holdsworth, learned to master several electric guitar techniques such as (taken from the man's page at Wikipedia) legato, two-handed and arpeggio tapping, volume swells, harmonics and extreme whammy bar effects...and eventually created his own recognizable style, becoming an influential guitarist himself, with over 10 million albums sold worldwide and no less than 15 Grammy nominations to his name!
Primarily an instrumentals player, Satriani nevertheless did a couple of “vocal” tracks on his last couple of studio albums, and that's where Unstoppable Momentum differs from its 13 predecessors, as none of the 13 tracks have any vocal contribution what-so-ever! It has, however, a great diversity of music. To get a whiff of that, look up the album's page at one of the trustworthy online sales websites (say Amazon, iTunes, Napster...you know what I mean!), as they usually provide 30-second samples of all songs on an album posted. For possible full-length versions of a couple of songs, consult Satriani's own website. Meanwhile, here's another addition to my personal “Album Of The Year 2013”-lists!