Performing during the show in position 19, "Bones" was announced among the top 10 entries of the first semi-final and therefore qualified to compete in the final on 12 May.

[1] The nation achieved their best result in the contest in 2017 with the song "Beautiful Mess" performed by Kristian Kostov, which placed second.

[5] A new feature of the selection process allowed for independent composers to submit their songs to be considered by interested producers.

[12] "Bones" was written by members of the songwriting team Symphonix International: Borislav Milanov, Joacim Bo Persson, Campbell and Dag Lundberg.

On 14 April, Equinox performed during the Eurovision in Concert event which was held at the AFAS Live venue in Amsterdam, Netherlands and hosted by Edsilia Rombley and Cornald Maas.

On 29 January 2018, a special allocation draw was held which placed each country into one of the two semi-finals, as well as which half of the show they would perform in.

Strobe lighting and a wind machine were used for the performance with overlaying camera shots also being used to create an effect that combined the group members into one.

[20][21][22] The stage concept and choreography of the Bulgarian performance was developed by Swedish artistic director Sacha Jean-Baptiste.

Each nation's jury consisted of five music industry professionals who are citizens of the country they represent, with their names published before the contest to ensure transparency.

This jury judged each entry based on: vocal capacity; the stage performance; the song's composition and originality; and the overall impression by the act.

In addition, no member of a national jury was permitted to be related in any way to any of the competing acts in such a way that they cannot vote impartially and independently.

The individual rankings of each jury member as well as the nation's televoting results were released shortly after the grand final.