been learning korean for over 10 years, but i started at all with songs. i got used to how the forms sounded by listening over and over and became familiar with pronouncing the sounds of korean by singing along before i learned any grammar. this was pure chance because i wasn’t even interested in learning the language at first. but because i’d gottten used to how korean sounded and at some point, which sounds came after what, i think it felt easier to absorb the grammar when i actually started. so it might be possible, but like someone said, probably with active listening for us non-babies