Following a series of High Court orders six UK ISPs are required to block subscriber access to many of the largest pirate sites.
The efforts started in 2012 and the list continued to grow in the years that followed.
In a new wave the BPI, which represents the major record labels, has teamed up with music licensing outfit Phonographic Performance Limited to obtain an order targeting a series of MP3 download sites.
This latest round expands the UK blocklist by 17 MP3 download sites, including stafaband.info, rnbxclusive.se, plixid.com and mp3.li. It brings the total number of blocked sites over a hundred, 110 to be precise.
Nearly all of the newly blocked sites are so-called MP3 search engines. However, the list also includes megasearch.co, a website that allows users to find files on the Mega cloud storage service founded by Kim Dotcom.