Growing up, Trainor was introduced to 1950s music, doo-wop, jazz, and the works of James Brown by her father, and she credits 1950s music, soca, and Frank Sinatra for influencing her hip hop, pop musical blend. As a songwriter, she is influenced by Sinatra: "No one writes like anymore, because it's hard" she said. Other influential artists have included Stevie Wonder, Phil Collins, Christina Aguilera, Earth Wind & Fire and Jason Mraz.