Original sentence: James would have been making songs as early as 1985 (haveing been born in 1971, he would have been 13-14 years old when he made some of these songs)
Edited sentence: A good number of the songs share similarities to electronic music genres like acid techno that did not exist until 1987.James would have been making songs as early as 1985 (Being born in 1971, he would have been 13-14 years old when he made some of these songs).The fact that the date when each song was composed is not clearly indicated, and sounds like it was made from 1985 onwards