If the HDD #s are very close (for example 125k, 128k, 130k), the Soundscan #s (official) could differ from the HDD #s - giving the #1 to any of those top three competitors.
If the HDD #s are very close (for example 125k, 128k, 130k), the Soundscan #s (official) could differ from the HDD #s - giving the #1 to any of those top three competitors.