Original sentence: Albums from the mid-1960s and before are underrepresented due to the smaller album buying market of that time; albums from the digital music era on may be underrepresented due to the decline in conventional album sales
Edited sentence: Albums from the mid-1960s and before are underrepresented due to the smaller album buying market of that time; albums from the Napster era on may be underrepresented due to the decline in conventional album sales