"High Fidelity" is a song written and performed by new wave musician Elvis Costello on his 1980 album, Get Happy!!

Written about an adulterous couple where one member still hopes for reconciliation, "High Fidelity" reflected the personal struggles that Costello had been suffering at the time as a result of increased fame and controversy.

In his autobiography, Costello described "High Fidelity" as, "an incredibly sad, delusion of a song, in which a couple find themselves in different rooms with different lovers, one of them still irrationally believing their pledge will endure both the initial faithlessness and the solace of revenge.

"[2] Costello reflected on the song, "This amoral tale might have over-done the self pity had it not been for the comical drunkenness of the singer.

The single's B-side featured a version of Betty Everett's "Getting Mighty Crowded" recorded during the Get Happy!!

Reviewed at the time of release, Rolling Stone said, "Even as Costello whispers menacingly, the tune's tense, martial beat propels him toward the inevitable realization that he doesn't have any choice.

"[10] AllMusic declared it a "full-fledged masterpiece,"[11] while Trouser Press wrote, "'High Fidelity' is a dynamic song (with a bit of Four Tops sound) delivered with convincing grit and wit, and stands as one of Get Happy!!

Fueled by amphetamines and vintage vinyl, he and the Attractions jumped into 60s soul for the 20-track epic Get Happy!