Conversation so far:
What was Lou Reed's addiction?
Throughout the 1970s, Lou Reed was a heavy user of methamphetamine and alcohol.
When did Lou Reed get over his addiction?
From around 1979 Lou Reed began to wean himself off drugs.
What happened next after Lou Reed began to wean himself off drugs around 1979?
Lou Reed married British designer Sylvia Morales in 1980.
Are there any other interesting aspects about the Lou Reed article besides his marriage to Sylvia Morales in 1980?
Morales inspired Lou Reed to write several songs, particularly Think It Over from 1980's Growing Up in Public and Heavenly Arms from 1982's The Blue Mask.

Question: What was the commercial decline?
Self-contained rewrite: What was Lou Reed's commercial decline?