Marlon Williams and Let’s Eat Grandma will also perform alongside the new additions as support for Florence + the Machine and The National.
Lykke Li, Nadine Shah, and Khruangbin had been previously announced to perform on the same day.
Saturday 13 July just got bigger! Joining @Flo_Tweet and @TheNational, @Khruangbin, @LykkeLi and @NadineShah will be Blood Orange, Aldous Harding, @MarlonWMusic, @thelegofgrandma + Goat Girl Tickets on sale now: https://t.co/8xhgpBlv9e pic.twitter.com/9Xp9tzI7g0— BST Hyde Park (@BSTHydePark) March 15, 2019
British Summer Time has also announced a very special one-off performance from folk/rock legends Bob Dylan and Neil Young, who will both share the same stage for a co-headlining set.
Robbie Williams, Barbra Streisand, and Celine Dion have also been revealed as a headliner for the Sunday showcase. Support acts are yet to be revealed.
Last year's Birtish Summer Time saw Paul Simon play his last ever UK show, as well as performances from The Cure, Eric Clapton, Michael Buble, Bruno Mars and Roger Waters.