Photo by Gia Smith There's prolific, and then there's Derek Smith. The Boston musician's latest single with the Cosmic Vultures, "Hollow Choir," is his eightieth song in the past eight years. It also helps explain the genre psychedelic folk-rock. The song is a little over three minutes, but the genre makes it feel much more epic. It's smooth sounding with trippy little flourishes, particularly in the guitar. At times, it sounds almost Adult Contemporary, but it's far too psychedelic for that. It's the play between the mainstream and the alternative side of folk that makes "Hollow Choir" work so well. Derek Smith and the Cosmic Vultures have long had this ability to provide a little something for everyone, and their latest proves that more than previous ones have. Derek Smith says of his latest single: “This song sums up the feelings I have had towards my music career for the last few years. I am always being told what I should do or what I sh...