Happy Birthday to You. Each clue represents the total points from adding up the value of the Scrabble tiles in the words. (H + A + P + P + Y = 4 +1 + 3 + 3 + 4 = 15 eg.) "Birthday" = 17. "To" = 2. "You" = 6. A night on the tiles is a night on the town, maybe to celebrate someone's birthday.
Congratulations 'kiwirage'........ again I am astounded by the ability of jetpunkers to solve these challenges. The 'Tile' clue was the name of the individual 'Tiles' in scrabble (just a side hint). Your 'Honorary Gold Challenge Medal' is on the way..... to add to your collection........ Congratulations again.
Cool, I never would have got it without the direct Scrabble reference in your first comment clue. I figured out that it was probably a song with the tiles added up, but I got waylaid for a while when i discovered a rock band called Tiles. So I was looking through all their songs to try and find one that might fit. Whoops.