Possible Clues:

• One's first parts in place of singer
• With 64-Across, performer who is like the words sounded out at the starts of the answers to the four starred clues
• Put in words
• Tenor starts to vary oratorio in choral event
• Weakness about love, say
• Spoken sound
• Singer's concern
• To utter
• Speak of sin restraining love
• Soprano or tenor, say