Normally when you hear the words “three tenors,” you think of opera singers. In this case, three tenors—in addition to a soprano and a few other instruments—refers to the saxophone, which is perhaps the coolest voice in jazz. Saxophone Summit brings together the voices of Ravi Coltrane, Joe Lovano and Dave Liebman, a true Gathering of Spirits. The group was founded in 1977, with Liebman and Lovano joined by Michael Brecker. When Michael left us in 2006, Ravi took his place in the group.