Katsotaanpa viisujen virallisilta sivuilta ladattavat säännöt. Siellä sanotaan kappaleista seuraavaa:
Ja esittäjien määrä rajatan, mutta missään ei varsinaisesti sanota, että esittäjiä on lavalla pako olla:Songs
The compositions (lyrics and music) must not have been commercially released before 1 September 2017. In case the composition has been made available to the public, for example, but not limited to, on online video platforms, social networks or (semi-) publicly accessible databanks, the Participating Broadcaster must inform the ESC Executive Supervisor, who shall have authority to evaluate whether the composition is eligible for participation in the Event. In particular, the ESC Executive Supervisor shall assess whether such disclosure prior to the Release Date is likely to give to the composition an advantage in the Event vis-à-vis the other compositions. The ESC Executive Supervisor shall authorise or deny participation of a composition which may have been available to the public as described above, subject to the prior approval of the Reference Group.
The maximum duration of each song is three minutes. Any song/performance which is longer may be disqualified by the EBU Permanent Services after consultation with the Reference Group.
Performances and artists
Each performance may consist of a maximum of six people on stage. No live animals shall be allowed on stage.
All artists competing in a Semi-Final must be aged at least 16 on the day of the Final. All artists competing only in the Final must be aged at least 16 on the day of the Final.
No artist may compete for more than one country in the ESC in a given year.
Each Participating Broadcaster is free to decide the language in which its artist(s) will sing.
Artists shall perform live on stage, accompanied by a recorded backing-track which contains no vocals of any kind or any vocal imitations aiming at replacing or assiting the live/original voice of the Contestant(s). The Host Broadcaster shall verify respect for this rule.
The stage performance shall be identical in all second Dress Rehearsals and during the live Shows.