Possible Clues:

• ''I Want to Be Happy'' musical
• Musical with a double negative in its title
• 1925 musical based on the play "My Lady Friends"
• 1925 musical that spawned the unsuccessful "Yes, Yes, Yvette"
• Old show number soon getting taken up - a bit of music going round
• "Tea for Two" musical
• Musical that spawned the unsuccessful "Yes, Yes, Yvette"
• 1920's musical with the sequel 'Yes, Yes, Yvette'
• 1925 musical featuring 'Tea for Two'
• 1925 hit musical with the song 'Tea for Two'