2010 CHART REWIND. Music Week and Nielsen Music recently presented stats on what songs got most airplay on UK radio last year. WelcheMusic first wrote about “California Gurls” back in July last year. Katy Perry collaborated with Snoop Dogg on the track, which topped the airplay chart for five weeks. It took a while to get there, Perry first entered the chart at No.119 and took eight weeks to reach the top. In total, “California Gurls” racked up 69,592 plays across the UK and won over Lady Gaga’s “Alejandro.” The latter has two singles inside the year-end top ten as “Bad Romance” was No.4.