In 1998, his song "O Gosto do Azedo", with lyrics dealing with struggles of HIV positive people to mingle,[1] was recorded by his mother Rita Lee, on her Acústico MTV album.

Along with remaining members Branco Mello, Sérgio Britto and Tony Bellotto, as well as session drummer Mário Fabre, he resumed the Nheengatu promotional tour[6] and later released the rock opera Doze Flores Amarelas.

In August 2017, Lee and fellow musicians Diego Guimarães and Edu Salvitti founded production company Trio Music, focusing on publicity, project creation, cultural contents, cinema and television soundtracks and original albums.

They released an album in 2004 via Astronauta Discos (Rio de Janeiro), titled Galaxy, which was promoted without the use of payolas and with some shows around the state of São Paulo.

The album featured songs such as "Dicionário Brasileiro", written by Otto, and covers of "Agora Ninguém Chora Mais", by Jorge Ben Jor, and "No Fun", by Iggy Pop and The Stooges.