Carly Rae

Rachel Platten - Stand By You went Top 40, but people are only gonna remember Fight Song
Dream - again, barely went Top 40 but He Loves U Not is their only remembered song
Vanessa Carlton
David Archuleta - His only real Top 40 hit was Crush, and his other Top 40 chartings were Idol covers.
Leona Lewis - Bleeding Love eclipsed Better in Time by light years in the US
Hilary Duff - I feel like the GP really only remember Come Clean
Puddle of Mudd - The GP only remembers Blurry, though they had another Top 15 hit after that song
Vertical Horizon - Everything You Want is their most successful song, and the only remembered one even though they had another Top 40 hit.
Adam Lambert - Whataya Want From Me is pretty much his only memorable hit.