Question: which singer has the most number one hits?
Answer: Madonna. Madonna. 4M subscribers. Subscribe. Madonna - Vogue (Official Music Video) ... 
Michael Jackson. michaeljacksonVEVO. 8.2M subscribers. Subscribe. ... 
Rihanna. RihannaVEVO. 25M subscribers. Subscribe. ... 
Mariah Carey. MariahCareyVEVO. 3.1M subscribers. Subscribe. ... 
The Beatles. TheBeatlesVEVO. 1.3M subscribers. Subscribe.