Some context: Swans () are an American experimental rock band formed in 1982 by singer, songwriter and multi-instrumentalist Michael Gira. One of few acts to emerge from the New York City-based no wave scene and stay intact into the next decade, Swans have become recognized for a unique, ever-changing sound which has contributed to the development of genres such as noise rock, post-punk, industrial and post-rock. Initially, their music was known for its sonic brutality and misanthropic lyrics. Following the addition of singer, songwriter and keyboardist Jarboe, who first appeared on the 1986 single "Time Is Money (Bastard)" and debuted as a songwriter on the 1987 album Children of God, Swans began to incorporate more melody and intricacy into their music.
Kane compares Swans to blues icon Chester Burnett, a.k.a. Howlin' Wolf. Some similarities worth noting--the music of early Swans was often based on a single riff, played repeatedly to hypnotic effect. Some of Burnett's songs--especially the songs penned by Burnett himself--have a similar structure and quality. Their early music was typified by slow and grinding guitar noise, and pounding drums, punctuated by Gira's morbid and violent lyrics (inspired by Jean Genet and Marquis de Sade), usually barked or shouted. Critics have described Swans' early recordings as "aggressive beyond words".  Their first full-length release, Filth (1983), featured driving, choppy rhythms and abrasive drums. The whole is reminiscent of earlier no wave bands, such as Mars, and the work of Swans' contemporaries, like Sonic Youth's Confusion Is Sex and Kill Yr Idols; but critic Ned Raggett contends that "early Swans really is like little else on the planet before or since". Filth was the first album to feature guitarist Norman Westberg, who would play a vital role in much of Swans' music and would feature on every subsequent studio album apart from Love of Life.  Cop (1984) and the originally untitled Young God EP were both released in 1984 and re-released together on CD in 1992. Young God has been known by several names, usually by one of its two A-sides, such as "I Crawled" or, notoriously, as "Raping a Slave". This release is often confused with their self-titled debut. The music continues in the same vein as Filth, and is again vaguely reminiscent of heavy metal music played in extreme slow motion. Swans were, in this era, Gira on vocals, Westberg on guitar, Harry Crosby on bass guitar and Roli Mosimann on drums. Gira's vocals had changed slightly, becoming slowly more melodic, although the snarl still remained. Some of the songs on the EP, particularly "Young God" and "I Crawled", have an actual vocal melody, if rudimentary, hinting at the sounds of future releases. Young God is considered by many to be the best of their early releases for this reason.  Justin Broadrick shared this impression of the group:
Why was Swans compared to earlier no wave bands?
A: driving, choppy rhythms and abrasive drums.
Some context: Pendulum is an Australian drum and bass and electronic rock band founded in 2002. Pendulum originally formed in the city of Perth, Western Australia by Rob Swire, Gareth McGrillen, and Paul "El Hornet" Harding. The band was later expanded to include members, Ben Mount, Peredur ap Gwynedd, and KJ Sawka. Members Swire and McGrillen also formed the electro house duo Knife Party.
When Pendulum was formed, their musical style was considerably more drum and bass sounding than the work they were known for later in their career. Signature tunes such as "Masochist", "Vault", "Back 2 You" and "Voyager", which were released on labels such as Uprising Records, 31 Records, Renegade Hardware and Low Profile Records, have a darker, more amelodic air to them which is substantially absent from their later productions. The band's newer work is regarded as generally leaning heavily towards a mainstream, dance-driven sound. Early work such as "Another Planet" seems to indicate an early affinity with a more global sound, similar to other Breakbeat Kaos artists such as DJ Fresh and Adam F.  The group has produced various remixes of other artists also; one of the best-known being the remix of "Voodoo People", originally by The Prodigy. In 2008-2010, they covered/remixed songs including Led Zeppelin's "Immigrant Song", Linkin Park's "The Catalyst", Calvin Harris's "I'm Not Alone", Coldplay's "Violet Hill", and Metallica's "Master of Puppets". Pendulum's versions of "I'm Not Alone" and "Master Of Puppets" both exist as studio recordings but have not been officially released, and are only previewed during DJ sets. The original live version of "Master of Puppets" was played as an instrumental introduction for "Slam", and was featured on their first live album/DVD. During their American tour as the supporting band for Linkin Park, the song was played in its entirety, with Rob doing vocals. Pendulum have also remixed their own music and, on occasion, television theme songs, such as Australian television's "ABC News Theme" in May 2010. The remix proved to be immensely popular with listeners of Australian youth radio station Triple J, polling at number 11 in the 2010 Triple J Hottest 100 countdown.  Pendulum's musical style consisted of a fusion of drum and bass (along with other electronic genres), alternative rock and heavy metal, with the inclusion of acoustic instruments. This creates a sound reminiscent of electronic rock, albeit with much more prominent drum and bass and, more recently, dubstep influences. Some songs, such as "Slam", "Propane Nightmares" and "Witchcraft" are synth-led, whilst others, such as "Showdown", "The Tempest" and "Comprachicos", are guitar-led. Bassist Gareth McGrillen stated in an interview on Channel 4 that they use 13 computers during the live performances, all of which are mixing the sounds produced by the instruments in real time. Rob Swire stated in issues of TJECK magazine and Rock Sound magazine that he would like to begin producing songs with a punk style to them, which Gareth clarified to mean "A raw, aggressive, less polished method of producing". Pendulum were known to be fans of progressive rock and progressive metal bands, which may have inspired them to fuse multiple genres of music together, which is standard practice in those genres.
did they remix stuff
A:
remixes of other artists also; one of the best-known being the remix of "Voodoo People