It covers not just the #1 hits, but all songs that "graced" the Billboard Hot 100 chart Archival Metadata:
A dataset of this size represents more than just music; it is a repository for research. billboard top 100 hits of 19562012 241gb link
Our collection of Billboard Top 100 hits spans 56 years, from 1956 to 2012, and features over 6,500 songs. This massive archive is a veritable treasure trove of musical history, showcasing the biggest hits of each year, as well as many lesser-known gems. It covers not just the #1 hits, but
: Every song ranked in the Billboard Year-End Top 100 from 1956 to 2012. from 1956 to 2012