Black Sabbath began work on their sixth album in February 1975, again in England at Morgan Studios in Willesden, London. They had a decisive vision to differ the sound from their previous album Sabbath Bloody Sabbath. Guitarist Tony Iommi, who produced the album, said that "We could've continued and gone on and on, getting more technical, using orchestras and everything else which we didn't particularly want to. We took a look at ourselves, and we wanted to do a rock album - Sabbath, Bloody Sabbath wasn't a rock album, really." Over the years, singer Ozzy Osbourne has often complained in interviews that this album marked the beginning of what he described as Tony Iommi's studio production obsession. Sabotage took considerably longer to record and produce than each of their preceding albums, making it the most costly Black Sabbath album to that point. In comparison, the band's first album, Black Sabbath (1970), took only 12 hours to record at a cost of a few hundred pounds. The album is a mix of heavy, powerful songs such as "Hole in the Sky" and "Symptom of the Universe", and softer experimental songs such as "Supertzar" and "Am I Going Insane (Radio)", which are similar to the band's previous album. The title of the latter caused some confusion due to the "(Radio)" part, which led people to believe the song was a radio cut or radio version. However, this is the only version of the song. The term "radio-rental" is rhyming slang for "mental". The song itself is very different