'Heart-Shaped Box.' But click tracks were not cool. Kurt and Steve came up with this idea — we should use a strobe light [laughs]. We had this long conversation about how it won't dictate the tempo, just imply the tempo. ... I sat there for a take or two with this fucking strobe light in my face until I practically had a seizure." Despite his overall satisfaction with the recording, Novoselic was unhappy with the original effect used during the song's guitar solo, and recalled arguing with Cobain and Albini about it: These were the words I said: 'Why do you want to take such a beautiful song and throw this hideous abortion in the middle of it? And they're like, 'Well, I don't know, it sounds good.' They didn't have any arguments, because they were sabotaging it is what the were doing. The guitar effect was eventually removed when the song was remixed, along with second single "All Apologies", by Scott Litt at Bad Animal Studios in Seattle in May 1993, several months before the album's release. Cobain and Novoselic had agreed that the vocals and bass were too quiet in Albini's original mix of the album, and elected to have the two future singles remixed. Litt's remix of "Heart-Shaped Box" also featured newly-recorded vocal harmonies and acoustic guitar by Cobain. Later performances On September 25, 1993, the band performed "Heart-Shaped Box", along with "Rape Me", on Saturday Night Live at NBC Studios in New York City. It was their first show with second guitarist Pat Smear. "Heart-Shaped Box" was the final song played at Nirvana's last show, on March 1, 1994, at Terminal 1 of Munich-Riem Airport in Munich, Germany. Composition "Heart-Shaped Box" is an alternative rock song that lasts for a duration of four minutes and thirty-nine seconds. According to the sheet music published at Musicnotes.com by BMG Rights Management, it is written in a 4/4 time signature, with a moderate tempo of 100 beats per minute. It is in the key of G minor, modulating to G dorian on the verses, while Kurt Cobain's vocal range spans one octave, from the low note of G3 to the high note of G4. The song has a basic sequence of G5–E5–C5–G–E5–C7 in the verses and G5–E5–C7 during the chorus as its chord progression. Journalist Gillian Gaar described "Heart-Shaped Box" as "the Nirvana formula personified, with a restrained, descending