The late 1990s were the peak of global recorded sales revenue, nearing $30 billion dollars right before Napster in 1999. As of this year, global revenue is near $13 billion dollars.
"In 2017 revenues from recorded music in the United States increased 16.5% at estimated retail value to $8.7 billion, continuing the growth from the previous year. At wholesale, revenues grew 12.6% to $5.9 billion. Similar to 2016, these increases came primarily from growth in paid music subscriptions to services like Spotify, Amazon, Tidal, AppleMusic, Pandora and others, which grew by more than 50%. This is the first time since 1999 that U.S. music revenues grew materially for two years in a row.
At $8.7 billion, the industry has taken a decade to return to the same overall revenue level as 2008, and is still 40% below peak levels as the growth from streaming has been offset by continued declines in revenues from both physical and digital unit based sales."
RIAA Releases 2017 Year-End Music Industry Revenue Report - RIAA