Having a conversation with Noel Gallagher requires a translator who speaks fluent Mancunian. I’ve sat with the man several times and I’ve had to ask him to repeat himself because I couldn’t understand a word he said. But when he sings, he’s totally understandable. No accent. Why?
The short answer is that singing prevents you from stressing syllables, the “supersegmentals,” if you want to get technical about it. The rhythm of a song often limits your ability to pronounce words–vowels, especially–in the way you would when you’re speaking normally. Your accent gets neutralized.
The full explanation can be found at BuzzFeed.