Peter Rycroft, known professionally as Lostboy, is a British songwriter and music producer.

Active in the music fields since 2010s, he has written and produced music across multiple genres, working with Tiësto, Rita Ora, Bebe Rexha, Ellie Goulding, Lewis Capaldi, Anne-Marie, Little Mix and Zedd. In 2023 he produced and co-wrote Calvin Harris' single "Miracle" which spent 8 weeks at No.1 in the UK,^[1] and Kylie Minogue's 2023 hit single, "Padam Padam", for which he won the Grammy Award for Best Pop Dance Recording.^[2]

Peter Rycroft began piano lessons at age six, then took drum lessons and joined several bands during high school. Originally planning to enroll at the Liverpool Institute for the Performing Arts to study song production, Rycroft took a gap year to tour with The Laurence Jones Band, and realized that he wanted to write songs.^[3] Inspired by Peter Pan, with whom he shares a given name, Rycroft began working under pseudonym Lostboy.

Fraser T. Smith got ahold of Lostboy's demo, and invited him to do additional production on songs for Anne-Marie and Gavin James. Lostboy soon began to work with an array of UK artists, writing and producing songs for Becky Hill, and producing 2019 single "Losing Me" for Gabrielle Aplin.^[3] Lostboy went on to co-write Zedd and Kehlani's 2019 single "Good Thing", to co-write with Lewis Capaldi Rita Ora's 2020 single "How to Be Lonely", to co-produce with Tiësto his and Ava Max's 2021 single "The Motto",^[4] and co-write and co-produce "Hate You" from Jung Kook's debut solo album "Golden", among others.

In 2022, Lostboy signed a global publishing deal with Sony Music Publishing UK.^[4]

In 2023, Lostboy co-wrote with Ina Wroldsen Kylie Minogue's hit single "Padam Padam" which he also produced. He also co-wrote and produced the song Rise by Freya Ridings for the teen comedy film Ruby Gillman, Teenage Kraken.^[5][6] The single is Minogue's first to break into the UK top 10 since 2011,^[7] and her first ever to chart on the Billboard Hot Dance / Electronic Song list, peaking at Number 10.^[8][9]

In 2023, Lostboy won Songwriter of the Year at the 2023 Music Business Worldwide A&R Awards.^[10]