Question: How many pop hits on the "Billboard" Hot 100 between 1955 and 1999 has this American composer and singer-songwriter of "It's Going to Take Some Time" written or co-written? 
Sentence (from "List of songs recorded by Kesha"): The album's lead single, and Kesha's solo debut single, "Tik Tok", was released in August 2009 and reached number one in eleven countries and spent nine consecutive weeks on top of the "Billboard" Hot 100.
Relevant evidence: No