Question: When was the artist that performed Chemical Heart formed?

full_context: Document 1: 1000 Miles (Grinspoon song): "1000 Miles" is the fourth single by Australian alternative metal, post-grunge band Grinspoon from their third studio album "New Detention" (June 2002). It was released on 18 August 2003 by Universal Music Australia, which reached the ARIA Singles Chart top 100.
Document 2: Secrets (Grinspoon song): "Secrets" was the second single by Grinspoon which was released from their second studio album "Easy". It was released in January 2000 on the Grudge label (the Australian imprint of Universal Records), reaching No. 83 on the Australian Singles Chart and polling at No. 73 on Triple J's Hottest 100 for 2000.
Document 3: Sensient: Tim Larner, also known by his stage name Sensient, is a psytrance act from Melbourne, Australia. His music can be described as his own unique style of dark, deep and funky progressive psytrance. After many compilation releases on respected international labels like Plusquam, Flow, ZMA and Sub Machine, Sensients’ successful debut album "Blue Neevus" was released on German label Tatsu Records in 2003. In the same year he set up his own label Zenon Records, which he has built into one of the most respected minimal/progressive labels in the scene. In 2004 he completed a 3 month tour of Europe and Japan. In April 2005 he released his second album “Pressure Optimal” on Zenon. In 2005 he made a 4 month tour of Europe and Brazil where he played at some of the biggest festivals including Voov Experience, Fusion Festival, and Arvika Festival. He played at Boom festival 2006 and later that year released his third album on Zenon, "Antifluoro", which was heralded as a landmark release in the minimal progressive trance genre. In 2007, he toured North America.
Document 4: Grinspoon: Grinspoon is an Australian rock band from Lismore, New South Wales formed in 1995 and fronted by Phil Jamieson on vocals and guitar with Pat Davern on guitar, Joe Hansen on bass guitar and Kristian Hopes on drums. Also in 1995, they won the Triple J-sponsored Unearthed competition for Lismore, with their post-grunge song "Sickfest". Their name was taken from Dr. Lester Grinspoon an Associate Professor Emeritus of Psychiatry at Harvard Medical School, who supports marijuana for medical use.
Document 5: What You Got (Grinspoon song): "What You Got" is the second single by Grinspoon from their fifth studio album "Alibis & Other Lies". The song was co-written by Phil Jamieson and Matthew Strong (Custard), who is the bass player in Jamieson’s side project, Lost Gospel. The single was only released in a digital format on iTunes.
Document 6: Lost Control: "Lost Control" is a song by Grinspoon. It was released on 12 May 2002, as the second single from their third studio album, "New Detention", and peaked at No. 29 on the ARIA Singles Chart. It also reached No. 14 on Triple J's Hottest 100 in 2002. The video shows a woman driving to a Grinspoon concert at Bondi beach, where the fans cause chaos. It is the official theme song for AFL Live 2004.
Document 7: Ready 1: "Ready 1" is a song by Australian alternative metal group Grinspoon which was released 18 October 1999 as the lead single from their second studio album, "Easy". It peaked at No. 36 on the ARIA Singles Chart. It was written by band members Phil Jamieson and Pat Davern. Jamieson has also performed the song as a solo artist.
Document 8: Rock Show (Grinspoon song): "Rock Show" was the third single by Grinspoon from their second studio album "Easy". It was released on 5 May 2000 on the Grudge label (the Australian imprint of Universal Records), reaching No. 78 on the Australian Singles Chart and polling at No. 33 on Triple J's Hottest 100 for 2000.
Document 9: Embrace the Curse: "Embrace the Curse" was re-released on June 24, 2008 due to the band signing a record deal with Glassnote Records. Some minor changes were made to the album, including changing the name of "Always Something" to "It's Always Better" and adding the band's third single, "I'm in Love With a Sociopath".
Document 10: Used to Get High: "Used to Get High" is a radio promotional single by Australian jam band, The John Butler Trio from their fourth studio album "Grand National". It was released by Jarrah Records in November 2007. It deals with the issue of addiction, and the many forms it takes.
Document 11: Hard Act to Follow: "Hard Act to Follow" is a song by Australian rock band Grinspoon and was released as the lead single from their fourth studio album "Thrills, Kills & Sunday Pills". It reached No. 24 on the ARIA Singles Chart and was ranked #16 on Triple J's Hottest 100 of 2004.
Document 12: Violent and Lazy: "Violent and Lazy" is the fourth single by Grinspoon from their second studio album "Easy". It was released on 13 November 2000 on the Grudge label (the Australian imprint of Universal Records), which peaked at No. 15 on the ARIA Alternative Singles Chart.
Document 13: Regulate the Chemicals: Regulate the Chemicals is an album by indie rock band Twothirtyeight. The album was originally released in 2000 through Takehold Records. It was pressed on vinyl by the now-defunct BlessedKilling Records in 2001. When Twothirtyeight signed to Tooth & Nail Records, "Regulate the Chemicals" was re-released with the songs "The Sticks Are Woven In The Spokes" and "Les Wirth". Chris Carrabba contributed backing vocals on the album.
Document 14: No Reason (Grinspoon song): "No Reason" is a song by Grinspoon. It was released as the third single from their third studio album "New Detention". The song peaked at top 62 on the ARIA Singles Chart and polled at No. 15 on Triple J Hottest 100, 2002.
Document 15: Chemical Heart: "Chemical Heart" was the first single released from Grinspoon's third studio album "New Detention" in 2002. It was a surprising change for fans because the grunge rock band had released ballads before, but they had never released one as their first single, and most people were expecting a hard rocking song like the later released single "Lost Control". The single marked a change in the band that could be seen after the year-long break they took from touring and recording, this time working with the record label Sony Universal, a joint venture with Sony BMG and Universal Music Group, instead of their low-key indie label Grudge Records.
ground_truth: 1995
sub_queries: Which artist or group performed Chemical Heart? Answer: Grinspoon
Which year witnessed the formation of Grinspoon ? Answer: 1995