Imunizacao Racional (Que Beleza)

Tim wrote it. Wikipedia calls it a haunting soul-reggae track, and Sounds and Colours hears a smooth soul song in the vein of the Isley Brothers; Mother Jones called it a joyful 1974 gem. Es Hoje says it was created before the rest of the album and only lightly altered, the one song to keep nearly all its original lyrics, and that Tim played it to RCA as an example of the conventional album he would make. It was the only track from the albums to get radio airplay. A shorter version, 3:29, closes Vol. 2, and Fleamarketfunk says the raw Luaka Bop version is from Vol. 2 while the Vol. 1 original is more mellow. We found no statement from Tim on the lyrics.

Marisa Monte wanted to record it for Barulhinho Bom (1996) but dropped the idea after Tim pressured her, per BBC Brasil. Jota Quest, with Os Garotin and Carlinhos Brown, released a new version on July 23, 2026 as the lead single of a Tim Maia tribute album due August 27, 2026. A student video contest around the 2006 reissue produced videos for this song and two others.