A Night at the Opera is the fourth studio album by the British rock band Queen, released on 21 November 1975 by EMI Records in the United Kingdom and by Elektra Records in the United States. Produced by Roy Thomas Baker and Queen, it was the most expensive album ever recorded at the time of its release. The album takes its name from the Marx Brothers film of the same name, which the band watched one night at the studio complex when recording. A Night at the Opera incorporates a wide range of styles, including ballads, songs in a music hall style, hard rock tracks and progressive rock influences.

"I'm in Love with My Car" is amongst Roger Taylor's most famous songs in the Queen catalogue. The song was initially taken as a joke by May, who thought that Taylor was not serious when he heard a demo recording.  Taylor played the guitars in the original demo, but they were later re-recorded by May on his Red Special. The lead vocals were performed by Taylor on the studio version, and all released live versions. The revving sounds at the conclusion of the song were recorded by Taylor's then current car, an Alfa Romeo. The lyrics were inspired by one of the band's roadies, Johnathan Harris, whose Triumph TR4 was evidently the "love of his life". The song is dedicated to him, the album says: "Dedicated to Johnathan Harris, boy racer to the end".  When it came down to releasing the album's first single, Taylor was so fond of his song that he urged Mercury (author of the first single, "Bohemian Rhapsody") to allow it to be the B-side and reportedly locked himself in a cupboard until Mercury agreed. This decision would later become the cause of much internal friction in the band, in that while it was only the B-side, it generated an equal amount of publishing royalties for Taylor as the main single did for Mercury.  The song was often played live during the 1977-81 period. Taylor sang it from the drums while Mercury played piano and provided backing vocals. It was played in the Queen + Paul Rodgers Tour in 2005 and the Rock the Cosmos Tour in 2008. Taylor would again play the song for his concerts with The Cross and solo tours, where instead of drums he played rhythm guitar.

Using a quote from the above article, answer the following question: was it on the B side?
reportedly locked himself in a cupboard until Mercury agreed.