A Letra A(The Letter A) is the fourth solo album released by Brazilian musician Nando Reis, and the first one after his departure from Titãs, where he sang and played the bass guitar. "Mesmo Sozinho" was previously recorded by Nando with Titãs on the album A Melhor Banda de Todos os Tempos da Última Semana, the last to feature him, and "Luz dos Olhos" was recorded live by Cássia Eller on her Acústico MTV album.
"Luz dos Olhos" was written by Reis under the request of Jorge Davidson, Sony's artistic director at that time, intending to use it on Cidade Negra's fourth album O Erê. The lyrics talk about seeing or not seeing a loved one, either literally or due to the physical absence of the person, and it also deals with Reis's strong myopia.[1]