Gal Costa's "Azul" stands as a defining track within her extensive Brazilian music career, showcasing her mastery of bossa nova and samba genres. Recorded for the 2005 compilation "Novo Millennium," the song reflects her enduring ability to blend traditional Brazilian sounds with contemporary arrangements. Costa, a pivotal figure in Brazilian music history, is renowned for her distinctive vocal style and her role in popularizing bossa nova internationally. This recording exemplifies her versatility, capturing the emotional depth characteristic of her work across decades. The track remains a testament to her contribution to the genre, offering listeners a glimpse into the sophisticated musical landscape of Brazil through her artistry.