Possible Clues:

• The first words of the answers to starred clues are a mnemonic for this musical symbol's staff lines
• 'E-G-B-D-F' musical symbol
• Music symbol
• In short, County Cricket Club departed abruptly heading for bar
• Character in front of the bars at the Albert Hall in summer?
• Musical symbol
• Conservative rebel felt around for musical symbol
• Musical character felt laid back about awkward celeb on right
• Music character around clubs left rebel in Dire Straits
• Notes with this: 3x150F