It's a very popular song, used by different brazilian club fans. Parody of "O Campeão". Sorry, we haven't got the full audio for this chant
Lyrics
Oooo, oooooo, ooo, Galo Oooo, oooooo, ooo, Galo Sunday, I’ll go to Mineirao Stadium, I’m going to support the team I love, I’ll take fireworks and flags with me, I’m not kidding, We will be the champions, I don’t want to sit at numbered chairs, I’ll go bleachers to feel the emotion, Because my team, Rules, And its name the Galoucura will say, Ooo, oooooh, oooooh, ooh, Galo, Ooo, oooooh, oooooh, ooh, Galo...