On this week’s Hot 100 chart, Meghan Trainor’s “All About That Bass” climbs to No. 1 in its ninth week on the chart, giving the 20-year-old her first No. 1 single on the chart with her first chart entry. With that achievement, Trainor joins an elite group of female artists that have guided their debut Hot 100 entry to a No. 1 spot on the chart — Madonna, Rihanna, Taylor Swift and Adele can’t claim to have had their first Hot 100 hit reach the peak position, but these ladies can brush their shoulders off and tout the accomplishment.