Crucifixion has figured prominently in Easter cantatas, oratorios, and requiems. He was also a prolific composer of sacred vocal works&colon; masses, requiems, motets, etc. Flippin is also a professional bass vocalist specializing in the requiems, oratorios, and orchestra solos. Other works in the repertoire were Mahler's First, Berlioz Fantastique, the Mozart and Brahms Requiems. The second, shorter series is made up of elegies, epitaphs, and requiems. This mainly consisted of singing requiems and pontifical high masses. Requiems and Masses for marriages are really particular cases of a votive Mass. A large portion of his output is sacred music, including masses and requiems. Six requiems in four countries were celebrated. There were twelve chaplains ("hebdomidarii"), eight for daily services and four for requiems.