Sony Music Entertainment requested that Trainor's current publisher, Big Yellow Dog Music, pull Trainor's three self-released albums from circulation in the build-up to her major label debut, Title. As a result, Title is recognized as Trainor's debut studio album. It acts as a full-length replacement of her EP of the same name, and was released on January 9, 2015. The album debuted atop the U.S. Billboard 200, making her the 13th female Artist with a debut number 1 song and album. On March 3, Trainor released the third single from the album called "Dear Future Husband", which eventually peaked within the Hot 100 top 20. Trainor featured in Charlie Puth's first single "Marvin Gaye" which released also in March 2015. Her next single, "Like I'm Gonna Lose You" featuring John Legend, became her second number-one on the Australian Singles Chart and third top 10 on the Billboard Hot 100. Trainor's first headlining concert tour, That Bass Tour, began on February 11, 2015, with Australian band Sheppard as the opening act. The album was to be further promoted through the MTrain Tour, with Charlie Puth and Life of Dillon as opening acts. It was set to begin on Friday, July 3, 2015. However, around that time or shortly afterward, in July 2015 (the online article did not specify a specific time) she was diagnosed with a vocal cord hemorrhage- a potentially serious but somewhat Common event among Singers, and was ordered by her medical team to undergo complete vocal rest, which has meant the cancellation or long delay of at least the first two dates in the MTrain Tour: a Friday performance of July 3, 2015 at the Borgata in Atlantic City, New Jersey, and the following Saturday night, the Fourth of July (Independence Day), at the Mohegan Sun, in Uncasville, Connecticut. On August 11, 2015, Trainor announced via social media that she was canceling the remainder of her North American tour due to further vocal cord hemorrhaging and would seek surgery "to finally fix this once and for all." On July 28, 2015, it was announced that Trainor was writing a song for The Peanuts Movie Soundtrack, entitled "Better When I'm Dancin'", which would be sung by her. "Better When I'm Dancin'", released with an accompanying music video, is also featured on Just Dance 2016's new subscription platform, Just Dance Unlimited. In August 2015, Trainor co-wrote Rascal Flatts' single "I Like the Sound of That". On October 30, 2015, Trainor appeared on Undateable as the musical guest. She also made a cameo appearance as a customer named Meghan. In late 2015, American singer Who Is Fancy released the single "Boys Like You", featuring Trainor and Ariana Grande. Title was the ninth best-selling album of 2015 worldwide, with 1.8 million copies sold according to IFPI.