One of the more unlikely jams we've ever heard of takes place at a guitar makers VIP get together at a music industry trade show Jan. 20.  Bob Weir, ex Guns N' Roses' Matt Sorum, The Doobie Brothers' Jeff "Skunk" Baxter, The Rascals' Gene Cornish and Robert Randolph will play together at the D'angelico Guitars event at NAMM (National Association of Music Merchants) in Anaheim.  It's invitation only and features a premium open bar.