2011 marked the 30th anniversary of Acoustic Alchemy; it was back in 1981 that Simon James and the late Nick Webb, Acoustic Alchemy's original co-leaders, started working together. These days, Acoustic Alchemy have two different co-leaders: Greg Carmichael and Miles Gilderdale. But even though James left in the mid-'80s and Webb died in 1998, the basic idea for the group has remained: two acoustic guitarists up front playing a light, unassuming mixture of jazz and pop…