Two guitar greats, Slash and Joe Bonamassa , teamed up Thursday night for a bluesy jam session as part of the Soho Sessions. Video from the night shows the two busting out a rendition of Bobby Bland’s 1957 classic “Farther Up the Road.” Slash takes the first lead, playing a creamy solo full of vibrato, a few pick squeals, and some impressively funky turnarounds. After a short breather, he kicks things up with a second go-around that charges forward in a higher register. While some notes sing,