He discovered that the true "Songbook" was a revered volume released in the early 1990s by the legendary label Velas . This wasn't just a pamphlet; it was a massive, meticulously curated tome containing the sheet music for dozens of Milton’s greatest hits, arranged for piano, voice, and guitar. It included the complex harmonic analysis of songs like "Raça" and the delicate melodies of "Canção da América."