Possible Clues:

• Voice said some cash is behind bar
• Highest male singing voice
• Male singing voice
• Singer's bar number, by Otis Redding initially
• Singer travelling on recent tour
• Singer in bar given banknote, we hear
• Resist trend, one that's hitting the high notes
• Bar, with five couples, disheartened older male singer
• Singer with sense to prop up bar
• Voice raised against the general trend