Question: Who started their musical career first Julian Cope or Screaming Trees?

Context paragraphs:
Screaming Trees: Screaming Trees was an American rock band formed in Ellensburg, Washington in 1985 by vocalist Mark Lanegan, guitarist Gary Lee Conner, bass player Van Conner and drummer Mark Pickerel.  Pickerel had been replaced by Barrett Martin by the time the band reached its most successful period.  Although widely associated with grunge, the band's sound incorporated hard rock and psychedelic elements.  During Screaming Trees' existence the band released seven studio albums, five EPs, and three compilations.

Rite²: Rite² is an ambient music album by Julian Cope, released in 1997.  It is technically Cope’s fourteenth solo album, but is also the follow-up to the earlier album "Rite" (released in 1992 and credited to "Julian Cope & Donald Ross Skinner") and is the second in the "Rite" series.

Jehovahkill: Jehovahkill is the eighth album by Julian Cope, released in 1992.  After the critical success of "Peggy Suicide" (1991), Cope's idea for "Jehovakill" was to incorporate a krautrock attitude into his music.  He began recording the album with musicians Rooster Cosby and Donald Ross Skinner, while co-producing it with the latter.  The sessions yielded what Cope considered to be his most sonically experimental material to date.  Originally titleing the record "Julian H. Cope", he sent an eleven track version to Island Records, who initially rejected its release, but relentfully gave Cope extra recording sessions for the album.  During the extra sessions, in which six extra songs were recorded, the album became harder and was retitled "Jehovahkill".

Van Conner: Van Conner (born March 17, 1967 in Apple Valley, California) is an American rock musician.  In 1984 he co-founded the band Screaming Trees with his brother Gary Lee Conner and close friends Mark Lanegan and Mark Pickerel.  On the 25 June 2000 Screaming Trees announced their official breakup.  Conner would start a low key band under the name Gardener which released its only album in the 1990s under the name "New Dawning Time".  Conner has also had brief appearances as a session musician with other known bands such as Queens of the Stone Age and helping Mark Lanegan on his solo album I'll Take Care of You.

Gary Lee Conner: Gary Lee Conner (born Lee Gary Conner on August 22, 1962 in Fort Irwin, California, USA) was the lead guitarist for rock act Screaming Trees, along with his brother Van Conner, who was the band's bassist.  Conner began his career with Screaming Trees in 1985 which lasted until their disbanding in 2000.  During that time he released two non-Tree albums: The Purple Outside-Mystery Lane (1990 New Alliance Records) with brother Patrick Conner on Drums and the single Grasshopper's Daydream/Behind The Smile (1999 sub pop) this album also featured Josh Homme from Queens of the Stone Age.  Appearances on other artists material include, Beat Happening "Indian Summer" and "Midnight a Go-Go" from "Jamboree" as well as "Against the 70s" by Mike Watt from "Ball-Hog or Tugboat? " (1995 Columbia Records).  After ten years of seclusion he finally released a new album in 2010 from his band Microdot Gnome.  The album "4D Sugarcubes" was released on Moonbus International Recordings in April 2010 as was available on CD and MP3.  At the moment he is planning future releases from Microdot Gnome.  In August 2016, Conner released a long-awaited solo album, Ether Trippers, on Strange Earth Records.

Change Has Come: Change Has Come was the only recording the Screaming Trees released through Sub Pop.  Released in 1990 the Screaming Trees then moved on to a major label, Epic Records, for their next three albums - "Uncle Anesthesia", "Sweet Oblivion," and "Dust", as well as the "Something About Today" EP.

Beat Happening/Screaming Trees: Beat Happening/Screaming Trees is an EP and a one-off collaboration between Beat Happening (from Olympia, Washington) and Screaming Trees (from Ellensburg, Washington).  Originally released on Homestead Records in 1988, it was later reissued as part of Beat Happening's box set "Crashing Through" in 2002.  The journal of Kurt Cobain contains a draft of a letter sent to Mark Lanegan, in which he described "Polly Pereguin" as his favorite pop song of the 1980s.

Julian Cope: Julian David Cope (born 21 October 1957) is an English musician, author, antiquarian, musicologist, poet and cultural commentator.  Originally coming to prominence in 1978 as the singer and songwriter in Liverpool post-punk band the Teardrop Explodes, he has followed a solo career since 1983 and worked on musical side projects such as Queen Elizabeth, Brain Donor and Black Sheep.

Screaming Trees discography: The discography of Screaming Trees, an Ellensburg, Washington-based rock band, consists of seven studio albums, three compilation albums, five extended plays (EP), and six singles, though this does not include any solo material recorded by the individual members of Screaming Trees.

Floored Genius: Floored Genius - The Best of Julian Cope and The Teardrop Explodes 1979-91 is a compilation album by Julian Cope, released in 1992, combining Cope's work with The Teardrop Explodes and his early solo work.

Supporting paragraphs: Screaming Trees Julian Cope
Answer: Julian David Cope