Possible Clues:

• In words --- syllable
• "It's six ___, half dozen ..."
• ''Six __, and half . . .''
• ''Six ___, half a dozen . . .''
• Be ___ mind (agree)
• A terrible band is lucky to have an audience ___
• -- mind (in agreement)
• Counting Crows "A Murder ___"
• ___ mind (in agreement)