Billboard Hot 100

The Billboard Hot 100 is the main U.S. singles popularity chart issued weekly by Billboard magazine. The new charts go into effect every Saturday, while the charts are posted every previous Thursday on the website.

Nielsen SoundScan

Currently, sales performance of singles are tracked by Nielsen SoundScan, and radio airplay performance of singles is tracked by Nielsen Broadcast Data Systems. Since Nielsen Soundscan's implementation in May 1991, it was reported that people like most songs longer than previously suspected (thus double-digit consecutive week runs at number one). Because of the double-digit consecutive weeks runs at number one, the amount of number ones for a year have dropped considerably. The four years Billboard posted the least amount of number ones in Hot 100 history were 2002 (seven number one hits), 1996 (eight number one hits), 1994 and 1997 (nine number one hits).

Related Topics:
Nielsen SoundScan - Nielsen Broadcast Data Systems - May - 1991 - 2002 - 1996 - 1994 - 1997

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