She also debuted a previously unheard track featuring Charli XCX and Raye called Girls, bringing both stars on stage.
"It was the first time I have played either of those live," she tells Newsbeat after her set, in blazing sunshine.
"I wanted to do that because I wanted to give the listeners just a little taster of the brand new stuff."
She admits she had no idea how the crowd would respond.
"I haven't done something like that in two years or something," she says.
"To perform my new song, I was so nervous and it has just been the best support in the world.
"I haven't put anything out in ages so my fans are really the best in the world."
Katy Perry's headline set on Saturday night also featured new live outings for tracks on her upcoming new album Witness.
The performance, which was her only show before her world tour starts in September, included Chained To The Rhythm, Bon Appetit and Swish Swish. She had only played these live a couple of times before her trip to Hull.
In their first UK show for three years, HAIM opened with Want You Back - the first track taken from their second album Something To Tell You.
They closed with their pulsating comeback single, Right Now.
"It's so nice to be back," they said.
"We love it so much, it was just such an awesome gig."
Plan B played his first live show in five years, headlining the Where It Begins stage on Saturday night.
He performed material from across his career but added in his latest track, In The Name Of the Man, a previous hottest record on Radio 1.
Speaking to MistaJam about his new music, he explained how his new more melodic sound has been influenced by family life.
"For me it was just about talking abut love and gratitude for my daughter and this blessing which has been bestowed on me. That felt more natural to do in song form.
"I decided to leave the rapping outside of it [his new music]. That doesn't mean this is the end of me as a rapper."
London Grammar returned to the live scene after a break away to record their second album.
"It was amazing, we haven't played a festival in a while so it was quite a strange experience for us," Dot tells Newsbeat.
"I think we were all a bit nervous going on but we got there."
"I think by the last sentence of the last song I had relaxed into it," singer Hannah Reid explains.
"It's been a long time for us, the new music has been a long time coming for us, so it is really exciting."
Royal Blood played on Sunday night with a set combining tracks from self-titled debut and snippets of the follow-up, How Did We Get So Dark?, which is out in June.
Despite their newness, fans were singing along to latest tracks with just as much passion as the older ones. Something singer Mike told us he still finds "ridiculous".
"We kind of did our celebrating when we finished the album. We put so much hard work into it.
"It's always a strange feeling releasing it into the world. As each song comes out it becomes less your property and more everyone elses.
"I think we're ready to throw it out there and think about what we're going to do next."