sentences:  Cassidy began touring with his own group of musicians, performing Partridge songs, as well as hits from his own albums, to thousands of screaming teenagers in major stadiums across the US, UK, Europe, Japan and Australia.The Partridge Family's biggest hit came in 1970 with the song "I Think I Love You", written by Tony Romeo (who had previously written several of the Cowsills' hits), which peaked at #1 on the "Billboard" Hot 100 chart in December of that year.It sold over five million copies, outselling the Beatles' "Let It Be", was awarded a gold disc, and made the group the third fictional artist to have a #1 hit (after the Chipmunks and the Archies).