"Killer" is a song by British acid house producer Adamski. Written by Adamski and Seal and produced by Adamski, "Killer" was Adamski's breakthrough single, but is now more notable for featuring Seal as a vocalist. A major hit in the UK, it reached number one, spending four weeks at the top of the UK Singles Chart in May and June 1990. In total, the single sold over 400,000 copies in the UK, earning it a BPI Gold certification.

Both Adamski and Seal recalled that they were in financial trouble at the time of recording. Seal was almost penniless and was living in a squat. Although Adamski had his own following as a DJ and was enjoying success with his previous single "N-R-G", he was on a government scheme which paid his rent and allowed him £40 a week. Both Adamski and Seal were struck by the popularity of "Killer" following its release on 21 March 1990. The song went to the top of the UK charts, reached the top ten in many European countries, and sold strongly across the world. Adamski recounted his surprise at people singing the memorable bassline to him in the street and, in particular, at hearing the track played at a wedding in a hotel at which he stayed following a performance in Cambridge. Seal told Simpson, 'within a week, I went from being a relative nobody – this weird guy at raves, with silver bits in my hair – to a household name.'

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