After many hours of scientific research and much deliberation i have discovered that Track 7 is in fact The Best Song. Track 8 is The Worst.

The result for albums containing less than 7-8 songs were less conclusive, but the trends seemed to point to Track 2 as The Best and Track 5 as The Worst.

Research into albums with even fewer tracks was deemed "unnecessary", and the desired funding wasn't allocated. Apologies