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Sweekar was born in Vijayawada, India into a Telugu-speaking family. He started his career as a vocalist in the Niraval band. In 2014, he started playback singing with the song "2010 Summerlo" from the film Doosukeltha. Before making debut in playback singing, he has worked as an audio engineer. C/o Kancharapalem (2018) was his breakthrough film. Sangeetha Devi Dundoo of The Hindu quoted, "Sweekar Agasthi’s music stayed with me long after the film was over". "Asha Pasham" song from the soundtrack of the film received wide response.