The day that Florence Welch got “Always Lonely” tattooed in blocky print on her left arm, she wasn’t lonely at all. She’d spent a blissful day traipsing around New York with a close friend, visiting bookstores, savoring ice creams and coffee, feeling enamored and alive with the city’s possibilities. She wrote a poem about it, “New York Poem (for Polly),” which contained a line that became the title of the fourth Florence and the Machine album, “High as Hope”: “Heady with pagan worship/of water towers/fire escapes, ever reaching/high as hope.”

And yet there she was, in an East Village tattoo shop, getting that sad phrase inked on her body while her friend (Polly) looked on. Ms. Welch, the effervescent leader and songwriter of the British rock band Florence and the Machine, has made a specialty of wringing joy from despair, so she didn’t think twice about exposing her loneliness.

“I thought that I would just cement it,” she said, “because maybe if I just had it on there, I could own it somehow, make it a part of myself, or embrace that part that I find difficult.”

Ms. Welch, 31, is lately very ready to showcase her self-acceptance. Her New York poem is collected in “Useless Magic,” a book of her lyrics, poetry and drawings that’s out July 10. “High as Hope,” due June 29, is full of secrets she never thought she’d share, let alone sing and dance about in front of fans. Even for an artist who makes anthems out of the confessional — a painful breakup fueled “How Big, How Blue, How Beautiful,” the group’s last album — “High as Hope” represents a new openness, and a new confidence, for Ms. Welch.