How to train the Tenor voice as a Voice Professor and Opera Singer. I had a Tenor come into the voice studio this week with complaints from a conductor about their F on an [a] vowel. The conductor was telling them to put it forward, but all that did was engage the lower laryngeal muscles, raise the larynx and make their vibrato wider. Here is a vocal exercise you can use to check in with your tongue and identify tongue tension and tongue positions to see if that's the root cause of the problem.