Newest and 10th solo album, 'Inviolate', a nine- song opus that does indeed push the boundaries of instrumental guitar music this time out, Vai quite literally invented not just a new guitar, but also a new guitar- playing technique. The Hydra, the elaborate three- necked steampunk- inspired guitar that Steve holds on the album cover, is actually played on the song 'Teeth of the Hydra'. 'Inviolate' presents his most focused, streamlined and perhaps invigorating music in years. The album features a host of esteemed musicians, including Billy Sheehan, Vinnie Colaiuta and Terry Bozzio.