Unwritten, the title track of English singer-songwriter Natasha Bedingfield's debut album (released September 2004) bears some resemblance to Kiss Them for Me, Siouxsie and the Banshees' hypnotic ode to actress Jayne Mansfield (Released May 13, 1991). Similarities include: same key (F major), same tempo (100 bpm), close drum beats/rhythms, South Asian influenced percussion (tabla, hand-cymbals) and lead guitar/sitar riffs that emphasize the third note of the root scale.
Danish singer-songwriter Karen Marie Ørsted better known as MØ, officially released her track Pilgrim in March 2013, the same month as Lorde's Royals. However, Pitchfork writer Larry Fitzmaurice reviewed Mo's track the previous October. The two songs share a drumbeat, handclap/fingersnaps on the second and fourth beats and feature raw female vocals. The similarities seem to end there.
Both songs start with a similar percussive pattern, and the keys are not identical, but within a half-step apart (Ebish, E). "Rock Your Baby" was released in 1974, and "Heart of Glass" in 1979. The "B" section of "Heart of Glass" is clearly influenced by "Rock Your Baby". Both lyric melody lines start on the same note, and although RYB has a longer, more intricate chord pattern, technically, all the chords of HOG are in there. Start @ 1:43 in "Heart of Glass" for comparison.