Board Thread:Questions and Answers/@comment-5751180-20130907113326/@comment-6533096-20130910184135

Robbie Williams songs, usually enter the Top 40

Some songs re-entering after being used in ads (e.g. "Young at Heart" by The Bluebells on the Levi's 90's ad, "We Don't Have To Take Our Clothes Off" by Jermaine Stewart on a Cadbury's 2011 ad)

Ash songs from the A-Z Series only stay for only one week (e.g. Instinct, Embers, Carnal Love, Dare To Dream)

Glee songs, usually unsuccessful

Some acts having unsuccessful songs (e.g. All Time Low, You Me At Six, The Deftones, Frank Turner, Miles Kane)