On 5 October 2019, Radiotelevisión Española (RTVE) announced that it had internally selected singer Blas Cantó as its performer for what was going to be the 65th edition of the Eurovision Song Contest.

On 18 March 2020, after the contest was cancelled due to the COVID-19 pandemic, RTVE confirmed that Cantó would remain as their representative for the following edition of Eurovision, but with a new song.

On 20 February 2021, "Voy a quedarme" and "Memoria" competed in a two-song national final organized by RTVE, and aired on La 1 of Televisión Española, to select the song Cantó would perform in Eurovision.

Cantó performed "Voy a quedarme" thirteenth on the night, following Iceland's "10 Years" by Daði og Gagnamagnið and preceding Moldova's "Sugar" by Natalia Gordienko.

[8] Cantó was dressed in a black outfit by Jaime Álvarez,[9] and the staging, featuring a big moon, was designed by Marvin Dietmann.