This is the 8968th most frequent Russian word.
раиля
"Раиля" is a feminine given name in Russian.
In this sentence, 'Раиля' is used as a proper name (possibly female), indicating the person who has the action of singing.
Райля поет прекрасным голосом каждые выходные.
Railya sings with a beautiful voice every weekend.
Here, 'Раиля' refers to a person, likely the organizer or the notable person associated with the exhibition.
Сегодня мы посетим выставку Раиля.
Today we will visit the exhibition of Railya.
In this example, 'Раиля' is the person from whom the speaker learned interesting facts about painting.