Roberto Menescal’s musical life has had many forms. As a pioneer of bossa nova in the 1950s, he helped shape a sound now synonymous with Brazil. And as a producer and composer, he has worked with all the tropicália greats. But it’s his songwriting, particularly the all-time classic “O Barquinho”, that will endure: It’s the sound of lushness and longing rolled into perfect three-minute packages.