Use your mouth to sing and a shellfish to stroke your shamisen, and you'll be performing a shamisen song just like that! Yes, it's that easy. Just go find a shell, open your mouth, and you'll be singing one too in no time!
A shamisen song is just an 歌 (うた) but with a shamisen. They're still songs so they're said the exact same way!
Currently there are no similar looking kanji which exist in the WaniKani learning system