Carlo Machado Pianta (born April 2, 1967) is a Brazilian singer-songwriter, guitarist and bassist best known for being a founding member of two of the most important rock bands from Rio Grande do Sul during the mid-1980s: DeFalla and Graforreia Xilarmônica.

In 1985 he founded, alongside Edu K. and Biba Meira, the experimental rock group DeFalla (initially called Fluxo, but renamed DeFalla by Pianta's suggestion as a tribute to Spanish composer Manuel de Falla), but left the group in 1987, before the release of their debut album.

[1] Shortly afterwards he teamed up with brothers Alexandre and Marcelo Birck, and with then-Os Cascavelletes bassist Frank Jorge, to form Graforreia Xilarmônica; throughout the late 1980s to the late 1990s, the band released a demo tape and two studio albums, all three being critically acclaimed, but eventually broke up in 2000.

In 1993, he was a guest musician on the debut demo tape by Aristóteles de Ananias Jr., a side project to Graforreia Xilarmônica founded by the Birck brothers in 1988.

[2] During Graforreia Xilarmônica's hiatus, Pianta was a live musician for Júlio Reny's band, and formed the short-lived projects Ceres and Os Ascensoristas.