[To read an introduction to The Great Voices Project, click here.] [To read previous portions of the list, click the following links: #50-#46 … #45-#41 … #40-#36 … #35-#31 … #30-#26 … #25-#21 … #20-#16.] —————————– #15: Roy Orbison Honesty time: Roy Orbison is my favorite pop/rock singer of all time. Charting 22 songs in Billboard’s Top 40, Orbison is one of the most popular singers of all time. Able to sing crooning ballads (“Crying”) or pop classics (“Oh, Pretty Woman”), Orbison’s emotional voice has been idolized by nearly every male pop singer since. Don Was, a producer who worked with Orbison on occasion, stated that Roy’s voice was as…