I Will Totally Back Down.

Tom Petty and the Bank-makers.

Sam Smith, the English singer/songwriter whose single 'Stay With Me' reached #2 on the US Billboard charts in 2014, has agreed to pay royalties to rock and roll royalty Tom Petty because of that song's similarities to the 1989 hit 'I Won't Back Down.' If that doesn't make you immediately say, "Oh, that's what it reminded me of," check out this video that lines up the two songs and makes it very, very clear:

Sources: Digg | envanligfjant | Billboard