Background: Neutral Milk Hotel was an American indie rock band formed in Ruston, Louisiana by singer, guitarist, and songwriter Jeff Mangum in the late 1980s. The band is noted for its experimental sound, abstract lyrics and eclectic instrumentation. The first release under the Neutral Milk Hotel moniker was the 1994 EP Everything Is, a short collection of tracks featuring Mangum.
Context: The band's second album, In the Aeroplane Over the Sea, released in 1998 and also produced by Robert Schneider, is notable as a critically acclaimed and widely popular album. It is largely inspired by the story of Holocaust victim Anne Frank. During live performances, including the one released under the title Live at Jittery Joe's, Mangum has described some of the songs of this album as based on urgent, recurring dreams he had of a Jewish family during World War II. The album was highly praised by critics for its wildly inventive instrumentation and Mangum's provocative and impassioned lyrics. Although it was met with scant response from the general public when it was released, the recording has continued to gain momentum in indie music circles, selling over 300,000 copies, according to Merge Records. However, the record (along with the year of constant touring that succeeded it) took its toll on Mangum. The band abruptly went on hiatus, turning down all requests for shows, including a support slot for R.E.M.  Before Neutral Milk Hotel began their indefinite hiatus, Mangum played live at a house show on December 5, 1998 in Athens on Chris Bilheimer's birthday. The bill was shared with Elf Power, and the audience was made up almost completely of friends and bandmates. Playing solo and acoustic, Mangum opened the set with what was to be the only post-Aeroplane composition to be performed in public, "Little Birds," a song about a boy whose body becomes filled with miniature birds that protect him from his murderous father. Mangum finished the rest of the evening with most of the Aeroplane songs, encouraging the audience to sing along in substitute for the horn parts. For the last several songs, Scott Spillane took his trumpet into an adjacent room and played his parts through the wall. A recording of the show circulated on the internet, but it has never been officially released, most likely due to the poor quality of the recording.  Mangum played another show on December 31, 1998, at which he performed the songs "Oh Sister," "Engine," and "In the Aeroplane Over the Sea," joined by Koster and Spillane.  In the Aeroplane Over the Sea has been cited by several as one of the greatest albums of all time.
Question: How long did they stay on hiatus for?
Answer: indefinite hiatus,

Problem: Background: Supergrass were an English rock band, formed in 1993 in Oxford. The band consisted of brothers Gaz (guitar and lead vocals) and Rob Coombes (keyboards and backing vocals), Mick Quinn (bass and backing vocals) and Danny Goffey (drums and backing vocals). Originally a 3-piece, Gaz's brother Rob Coombes officially joined the band in 2002. The band signed to Parlophone records in 1994 and produced I Should Coco (1995), the biggest selling debut album for the label since the Beatles' Please
Context: In mid-1994, Supergrass issued their debut single "Caught by the Fuzz" on the small independent local label Backbeat Records. The song recounts lead singer and guitarist Gaz Coombes's experience of being arrested by the police for possession of cannabis. The limited release of vinyl copies sold out quickly, thanks in part to support from John Peel on his Radio One show. The Parlophone label signed the band and re-released the single in the autumn of the same year. It achieved the rare feat of both NME and Melody Maker "Single Of The Week" status in the same week.  "Mansize Rooster", released in February 1995, peaked at number 20 in the UK Singles Chart and "Lenny" was the band's first top 10 single. "Lenny" was followed soon afterwards by the band's debut album, I Should Coco (May 1995), which entered the UK Albums Chart at number one. It achieved half a million sales in the UK and over a million worldwide. NME reviewer Steve Sutherland gave the album a nine out of ten rating, writing, "These freaks shall inherit the earth." The album's fourth single, the double A-side release "Alright"/"Time", stayed in the UK Top Three for a month, peaking at number two.  Supergrass followed I Should Coco with 18 months of heavy touring, appearing at festivals such as Scotland's T In The Park and the Glastonbury Festival. After Performing at Rio's Hollywood Rock Festival in April 1996, Supergrass met the train robber Ronnie Biggs, and apparently said to him, "I was frightened for my life when I heard there was a supergrass in the area." A photograph of Ronnie Biggs and Gaz together was subsequently included in the music video for their 1996 single "Going Out". Recorded at Great Linford Manor the single peaked at number five in the UK charts, but was the last song produced by Sam Williams. Supergrass returned to Sawmills Studio to co-produce follow up album, In It For The Money (released April 1997), with John Cornfield. The album was a huge success and went platinum in the UK, but confused some fans expecting something similar to I Should Coco. The single, "Richard III", reached number two. Subsequent releases, "Sun Hits the Sky" and "Late In The Day", reached numbers 10 and 18 respectively.  Around this time Supergrass also appeared on the front cover of The Big Issue, interviewed for the magazine at Heathrow Airport by ex-drug smuggler Howard Marks.
Question: Did they appear on anything else?
Answer:
A photograph of Ronnie Biggs and Gaz together was subsequently included in the music video for their 1996 single "Going Out".