15 Advanced Studies (Bass Clef) 15 Advanced Studies for Tuba are based on popular tuba orchestral excerpts by Holst, Elgar, Brahms, Bruckner, Dvorak, Wagner, Mahler, Sousa, Franck, Tchaikovsky, Mussorgsky, Rachmaninov, Verdi, Ravel and Berlioz. 15 Advanced Studies for Tuba is listed on the Trinity Exam Syllabus for Tuba for Grades 6, 7 & 8.