Description (Vocal Instruction). Whether you are self-taught or taking lessons, learning for fun or heading for a career in the music industry, Trinity College London Rock & Pop exams will help you develop valuable playing skills and achieve your musical ambitions. Available for bass, drums, guitar, keyboard and vocals, from Initial (beginner) to Grade 8 (advanced), these exams cover a wide variety of music and artists giving a great choice in all rock and pop styles.