Both Simoncini and Perniola had previously represented San Marino in the Junior Eurovision Song Contest on separate occasions.

[1] The nation's debut entry in the 2008 contest, "Complice" performed by Miodio, failed to qualify for the final and placed last in the semi-final it competed in.

[7] On 27 November 2014, SMRTV held a press conference at their studio where they announced that they had internally selected singers Anita Simoncini and Michele Perniola to represent San Marino at the Eurovision Song Contest 2015.

[13] The song was selected to represent San Marino after the broadcaster opened a submission period for composers, producers and record companies to submit proposals.

[15] To promote the entry, a music video for "Chain of Lights" directed by Fabrizio Oggiano was released as part of the song's presentation on 16 March 2015.

[15] SMRTV staged an online contest titled "Build a Chain of Lights" where social media users could use the hashtag #SanMarino2015 on posts to enter to win prizes such as a meet and greet with the artists, a promotional press kit and more.

[18] Simoncini and Perniola also embarked on a promotional tour that included a visit to Moscow, and granted interviews to the local and international press in Austria in the lead up to the contest.

[24] The European Broadcasting Union (EBU) split up the competing countries into five different pots based on voting patterns from previous 10 years.

The duet performed choreographed movements on stage with four backing vocalists behind them dressed in black: Katrin Schild von Spannenberg, Pat Lawson, Ron van Lankeren and Julian Feifel.

The background LED screens displayed a rotating planet Earth that became covered in candles, forming chains around the world.

The jury consisted of five music industry professionals who were citizens of the country they represent, with their names published before the contest.

[36] This jury were asked to judge each contestant based on: vocal capacity; the stage performance; the song's composition and originality; and the overall impression by the act.