Applications are welcome from now until 7 May from music-makers interested in receiving personalised support, mentoring and live platform opportunities via the scheme.
Previous Horizons acts have been showcased at some of the biggest festivals from Glastonbury, The Great Escape, Festival No.6 and S?n to Eurosonic and SXSW.
They’ve also had the opportunity to perform at the BBC’s Maida Vale Studios.
In the three years of the project, previous Horizons alumni include Candelas, CaStLeS, Violet Skies, Kizzy Crawford and Seazoo.
This year, Horizons will be bringing music to festivals over the summer and offering more opportunities to Welsh musicians later in the year through its Launchpad funding scheme.
Also new for this year, The Horizons Project has hand-picked 12 Horizons bloggers who will help spread the word about the 12 new acts for 2018.
To be considered, go to bbc.co.uk/horizons to complete the online form.
Horizons acts will be selected by a panel of experts from within the partnership and the wider music sector. Successful applications will be notified after 21 May.