The week-long initiative takes place from 28 May until 1 June and offers young local talent the opportunity to develop their songwriting and performance skills.
Led by McCool, the musicians will work together to create new music and perform live at the British Music Experience Museum on 1 June.
She Drew the Gun drummer Sian Monaghan and singer-songwriter Chloe Foy are also involved.
To take part, you must be a musician, female, or identify as female, aged between 13 and 18, based in Merseyside and available for the whole week.
Sign up before 21 May. For more info, see https://www.eventbrite.co.uk/e/both-sides-now-residency-with-natalie-mccool-tickets-45444152684