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In page Glassheart (song):

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"Glassheart" is an up-tempo dance song that incorporates elements of dubstep, grime and house music. Lyrically, it is about a woman's fear that her boyfriend will leave her and thus she protects her emotions and her heart from breaking. The song received positive reviews from music critics, many of whom praised the musical direction and its grimy, dubstep breakdown. Upon the release of Glassheart, the song debuted at number 27 on the UK Dance Chart due to strong digital download sales during the first week of Glassheart's release. It debuted at number 167 on the UK Singles Chart. Lewis has performed the song at London nightclub G-A-Y and an acoustic version for UK newspaper The Sun's Biz Sessions.[citation needed]