OMSC 15

Online Music Song Contest 15, often referred to as OMSC 15, was the fifteenth edition of Online Music Song Contest, held in ???, after Finland won the previous edition of the contest.

The Semi-Finals of OMSC 15 occured on the 20ᵗʰ June 2021 while the Final occured on the 27ᵗʰ June 2021. Forty-one* countries participated in the fifteenth contest, under the slogan “???”.

Participants
Forty-one* countries participated in the fifteenth edition of the contest: fifteen European countries (Åland Islands, Bulgaria, Estonia, Finland, Germany, Italy, Lithuania, Luxembourg, Netherlands, Norway, San Marino, Serbia, Slovakia, Slovenia, United Kingdom), ten Asian countries (Israel, Japan, Lebanon, Philippines, Singapore, South Korea, Taiwan, Thailand, Turkey, Uzbekistan), six American countries (Canada, Jamaica, Peru, Puerto Rico, Suriname, United States of America), five Oceanian countries (Australia, Fiji, Marshall Islands, Micronesia, New Zealand) and five African countries (Egypt, Madagascar, Nigeria, South Africa, Tanzania).

In this edition Estonia, Lithuania, Madagascar and Slovakia participated for the first time.

Returning Artists
This edition featured one representative who had performed previously as lead vocalists for a country in the contest.

Perfume represented Japan in the tenth edition of the contest with the song "Flash" sung in Japanese, which placed 19ᵗʰ out of 46 participating countries with 48 points. In this occasion, they represented again Japan, this time with the song "Tokyo Girl", sung in Japanese again, trying to achieve a better result.

National Selections
Serbia, South Africa and Taiwan used a National Selection to determine the country's representative for OMSC 15.

Lagaval frá Íslandi (OMSC 14)
Main article: Lagaval frá Íslandi (OMSC 14)

Taipei's Calling (OMSC 15)
Main article: Taipei's Calling (OMSC 15)

Withdrawing Countries
These countries confirmed their non-participation in the fifteenth edition of the contest: