Related Clues:

• Opening segment, for short
• Words that come first
• Piece of counterpoint, roughly a couple of bars to start
• Starting lines?
• Preliminary remarks
• First class, informally?
• Basic course
• Opening some port, Nigel reflected
• "Ladies and gentlemen" could start one
• In refrain, trombone leads to start of music
• Emcee’s offering
• First course, for short?
• Show part with a theme song, maybe
• Song opening
• 'Skip ___' (streaming button)