"Cygnus X-1" (originally known as "Smiths Jamb") is an instrumental Weezer demo recorded in early consideration for the album that would eventually become Maladroit.
"Cygnus X-1" was originally written, according to the Catalog O' Riffs, in early October of 2001. It is first known to have been recorded during the sessions at Cello Studios in early November of that year, though it was not finished at that time. The song was later recorded at Glenn Sound Studios on November 14 for the radio station 107.7 The End, along with the songs "Slave" and "Space Rock", though the three songs never aired, and the band subsequently released them as free MP3s on their official website. Two early demos by Rivers Cuomo were released as part of the digital demo compilation Alone VIII: The Maladroit Years in November of 2020.
The basis for the song's title has never been commented on, but Cygnus X-1 is also the name of a galactic X-ray source in the constellation Cygnus discovered in 1964, and the first such source widely accepted to be a black hole. It is also the title of a two-part song by the band Rush from their 1977 album A Farewell to Kings.