librettist (n.)

• arranger
• balladeer
• bard
• choreographer
• comedian
• composer
• contrapuntist
• dramatist
• elegist
• gagman
• harmonizer
• jongleur
• laureate
• madrigalist
• maker
• minstrel
• modernist
• musicologist
• odist
• orchestrator
• playwright
• poet
• satirist
• scenarist
• scorer
• scriptwriter
• sonneteer
• symbolist
• symphonist
• tragedian
• troubadour