NASHVILLE (AP) — Country star Keith Urban returned to the stage during The Grand Ole Opry Friday night, hitting a few high notes in his first public appearance since vocal surgery late last year.Urban let loose with a "Yeehaw!" after a standing-room only crowd at Ryman Auditorium leapt to its feet when he took the stage.He played three songs and an unexpected encore. He was joined by a string quartet on "Long Hot Summer," then turned down the volume and sang "Making Memories of Us" microphone-free with the audience. His full band then joined him on stage for "You Gonna Fly" and "I Wanna Love Somebody Like You."Urban didn't address the surgery while speaking with the crowd.The 44-year-old Australian had a polyp removed from a vocal cord last November.