Billie Eilish headlines Lollapalooza Brazil 2023. Fans from all over Brazil packed the festival grounds and sang every lyric with immense enthusiasm. Joined by her brother FINNEAS, the two performed a rowdy set that the city of Sao Paulo will never forget. Oxytocin, known as the love hormone, is a powerful one for the mind and body. When you fall in love, oxytocin is released in your brain. Music also seems to have the ability to increase oxytocin levels, especially when people sing in a group, which adds the element of bonding.