Question: Which band was formed first, Audioslave or Okkervil River?

Context paragraphs:
Sham Wedding/Hoax Funeral: Sham Wedding/Hoax Funeral is a split CD featuring Austin, Texas "brother bands" Okkervil River and Shearwater.  It was first available only at North American tour dates in the spring and summer of 2004, but fans later were able to purchase it online.  The tracks include demos, unreleased songs and old standards.  Mark Pedini, former drummer of Okkervil River, provided the artwork for the album cover.

Will Sheff: Will Sheff (born July 7, 1976) is the frontman for the Austin, Texas-based indie band Okkervil River (1998–present).  Originally from Meriden, New Hampshire, he is also a founding member and co-songwriter (along with former Okkervil bandmate Jonathan Meiburg) for Shearwater (2001–2009), another Austin band.  Sheff writes and performs many songs as a solo artist while juggling his commitments to Okkervil River and Shearwater, but has released just one single as a solo artist.  As well as writing and singing songs, he plays the guitar, the piano, the banjo, and the harmonica.

Down the River of Golden Dreams: Down the River of Golden Dreams is Okkervil River's second full-length album, released on September 2, 2003.  William Schaff continued to create artwork for Okkervil River with this release.  The record label Jagjaguwar released the album on CD and vinyl under the catalog number JAG54.

The Stage Names: The Stage Names is the fourth full-length studio album by American indie rock band Okkervil River, released on August 7, 2007.  The album was recorded in Austin, Texas, with longtime Okkervil producer Brian Beattie, and with mixing from Spoon drummer and producer Jim Eno.  Like other Okkervil River albums, the accompanying artwork is the work of artist William Schaff.  The cover refers to a line from "Unless It's Kicks".  The record was also released as a limited-edition 2-CD set that included a second disc of solo acoustic demos.  A newly recorded version of "Love to a Monster", which appeared in rough demo form on the band's tour EP, "Overboard and Down", was originally intended to appear on the album, but didn't make it on, and appears as a bonus track when the album is purchased through eMusic.  "Shannon Wilsey on the Starry Stairs", described by lead singer and songwriter Will Sheff as "kind of a sequel to 'Savannah Smiles' and kind of a sister song to "John Allyn Smith Sails'", is included as a bonus track when the album is purchased through iTunes.

Okhta River (Neva basin): Okhta River (Russian: Óхта ) is a river in Vsevolozhsky District of Leningrad Oblast and the eastern part of the city of Saint Petersburg, Russia.  It is the largest right tributary of the Neva river.  It joins the Neva 12 km upstream of the Neva's mouth, within the city limits of Saint Petersburg.  The length of the Okhta is 90 km , and the area of its drainage basin is 768 km2 .  Its largest tributary is the Okkervil River (left).  The Rzhevsky Reservoir (5 km long, 120 m wide, with a volume of 4 mln m³) has been built on the Okhta.  The Utkina Dacha estate is located on the banks of the Okhta close to the mouth of the Okkervil.

Audioslave: Audioslave was an American rock supergroup formed in Los Angeles in 2001.  The four-piece band consisted of Soundgarden lead singer/rhythm guitarist Chris Cornell and Rage Against the Machine members Tom Morello (lead guitar), Tim Commerford (bass/backing vocals), and Brad Wilk (drums).  Critics first described Audioslave as a combination of Soundgarden and Rage Against the Machine, but by the band's second album, "Out of Exile", it was noted that they had established a separate identity.  Audioslave's sound was created by blending 1970s hard rock with 1990s alternative rock.  Moreover, Morello incorporated his well-known, unconventional guitar solos into the mix.  As with Rage Against the Machine, the band prided themselves on the fact that all sounds on their albums were produced using only guitar, bass, drums, and vocals.

Julie Doiron / Okkervil River: Julie Doiron / Okkervil River is an album release, a CD split between Julie Doiron and alternative country band Okkervil River, was released on July 23, 2003.

Okkervil River: Okkervil River is an American rock band led by singer-songwriter Will Sheff.  Formed in Austin, Texas in 1998, the band takes its name from a short story by Russian author Tatyana Tolstaya set on the river in St Petersburg.  They began as a trio made up of Sheff and friends he had met in his native state of New Hampshire but, over time, have gone through many lineups.

Stars Too Small to Use: Stars Too Small to Use is Okkervil River's second EP, released in mid-1999.  It was recorded live over a span of three days in 1998 when the band was still forming.  Three of the tracks appeared revised on later recordings: "He Passes Number Thirty-Three" on the 2003 split EP "Julie Doiron / Okkervil River", "The Velocity of Saul at the Time of His Conversion" on the 2003 album "Down the River of Golden Dreams", and "For the Captain" on the 2005 EP "Black Sheep Boy Appendix" (as "Another Radio Song").

Black Sheep Boy: Black Sheep Boy is the third studio album by American indie rock band Okkervil River, released on April 5, 2005.  The title is inspired by the song "Black Sheep Boy" by 1960s folk singer Tim Hardin.  The album deals with Hardin's struggle with heroin addiction and Okkervil River lead singer Will Sheff's failed relationships and heartbreaks.  The album cover features the work of Providence artist William Schaff.

Supporting paragraphs: Audioslave Okkervil River
Answer: Okkervil River