By Jill Clendening NASHVILLE, TN — Nashville musician and producer Jesse Boyce compares the anxiety he felt just before receiving palliative radiation therapy to the jitters he often experienced before going on stage. The instant treatment began — and as the first note rang out — his anxiety was replaced by a sense of peace and determination. Boyce, whose incredible career as an instrumentalist, bandleader, vocalist and songwriter includes a long stint alongside his mentor and friend Little Richard, is being treated at Vanderbilt University Medical Center for recurrent, incurable prostate cancer. His journey has been documented in a feature film,…