Question: "The Black Angel's Death Song" was written by John Cale and an American musician who had a solo career that spanned how long?

Context paragraphs:
Black Angel Blues: "Black Angel Blues", also known as "Sweet Black Angel" or "Sweet Little Angel", is a blues standard that has been recorded by numerous blues and other artists.  The song was first recorded in 1930 by Lucille Bogan, one of the classic female blues singers.  Bogan recorded it as a mid-tempo, twelve-bar blues, featuring her vocal with piano accompaniment.

I Wanna Talk 2 U: "I Wanna Talk 2 U" is a song by Welsh musician and composer John Cale.  It was released as a digital single on 6 July 2012.  It was the first single from Cale's new album "Shifty Adventures in Nookie Wood".  This single was released only as digital single, but not on CD or vinyl record.  Music was composed by Cale along with Danger Mouse (real name Brian Burton) and lyrics by Cale himself.

Close Watch: An Introduction to John Cale: Close Watch: An Introduction to John Cale is the third compilation album by Welsh musician John Cale, released by Island Records in April 1999.  It featured songs from Cale's albums released between 1973 and 1996.

Sweet Black Angel: “Sweet Black Angel” (sometimes known as “Black Angel”) is a song by the Rolling Stones, included on their 1972 album "Exile on Main St." It was also released on a single as the B-side to "Tumbling Dice" prior to the album.

Northern Sky: "Northern Sky" is a song from the English singer-songwriter Nick Drake's 1970 album "Bryter Layter", produced by John Cale.  During the recording sessions for the album, the chronically shy and withdrawn songwriter formed a friendship and a mentorship of sorts with producer Joe Boyd.  Boyd was an early supporter of Drake, and saw commercial potential in the acoustic and unaccompanied demo version of the song, and recruited former Velvet Underground member John Cale to produce.  Cale added piano, organ and celesta arrangements, initially against Drake's wishes.

Lou Reed: Lewis Allan Reed (March 2, 1942 – October 27, 2013) was an American musician, singer and songwriter.  He was the guitarist, vocalist, and principal songwriter of the Velvet Underground, and his solo career spanned five decades.  The Velvet Underground had little success during their active years, but later gained a significant cult following to become one of the most widely acclaimed and influential bands in rock history.  Brian Eno famously stated that, while the Velvet Underground's debut album sold only 30,000 copies, "everyone who bought one of those 30,000 copies started a band".

The Black Angels (band): The Black Angels are an American psychedelic rock band from Austin, Texas.  They have released five studio albums and one compilation album.  Their name is derived from the Velvet Underground song "The Black Angel's Death Song".

Shifty Adventures in Nookie Wood: Shifty Adventures in Nookie Wood is the fifteenth studio album by Welsh rock musician John Cale.  It was released on 1 October 2012 in Europe and 2 October in North America on the Double Six Records imprint of Domino Records.  It was released as digital download, heavyweight vinyl and CD.  Most of the songs were recorded by John Cale in his own studio in Los Angeles.  On one track he collaborated with Danger Mouse.  In September 2011 Cale released the "Extra Playful" EP and its release promised that the new album would be released the following year.  It is his first studio album since 2005's "blackAcetate".

The Black Angel's Death Song: "The Black Angel's Death Song" is a song by the Velvet Underground, from their 1967 debut album "The Velvet Underground & Nico".  It was written by Lou Reed and John Cale.  In a footnote to the lyrics, Lou Reed wrote: "The idea here was to string words together for the sheer fun of their sound, not any particular meaning."

If You Were Still Around: "If You Were Still Around" is a song by Welsh musician and composer John Cale.  It was written by John Cale together with playwright Sam Shepard.  It was originally released on Cale's 1982 album "Music for a New Society".  On 27 October 2014, a year after the death of his The Velvet Underground–bandmate Lou Reed, Cale released a new version of this song.  For this version was also released music video directed by Abigail Portner.  At the beginning of the video Cale is lying on the floor in a fetal position and after he views the photos of Reed and other deceased people associated with the Velvet Underground and The Factory: Sterling Morrison, Nico, Andy Warhol, and Edie Sedgwick.

Supporting paragraphs: The Black Angel's Death Song Lou Reed
Answer: five decades