It's hard to miss the melodic similarity of "Influência" with "Moonlight in Vermont" (Karl Suessdorf, 1944):
An English translation of the lyrics and some background on "Influência" are on Victoria Broadus' very interesting website, lyricalbrazil.com.
While I hear "Moonlight in Vermont" as a likely starting point for Lyra's melody, Broadus suggests parallels with "You Were Meant for Me" (Nacio Herb Brown, 1929, but best known from its use in "Singin' in the Rain," 1952) and "Indian Love Call" (Rudolf Friml, 1924, but redone over the years by many artists).
Here's another - Franz Lehar's "Meine Lippen, sie küssen so heiss," from his operetta "Giuditta" (1934). I heard this one on the PBS "Classic Arts Showcase" the other night. The melody in question is at 1:08.
Chronologically, the order is Friml - Brown - Lehar - Suessdorf - Lyra. There definitely are some similarities, some closer and some a bit of a stretch.
The similarities don't really prove anything. Good melodies can be independently arrived at; if there is borrowing it can be unconscious. Some of these similarities are certainly just coincidence. Correlation does not imply causation. I still think Lyra was referencing "Moonlight," though.
