Using infinitive or participle form

[isahne]

Hello Teachers!
Please help.

Re:From the 1950s popular song lyrics (proclaiming/to proclaim) that "Captain Smith and Pocahontas Had a Very Mad Affair" to the 1995 Walt Disney animated film, the legend of Pocahontas has been widely popular in American culture.


It's a selecting right word quiz. According to the answer, "proclaiming" is right.
Why not use "to proclaim" instead of "proclaiming". I'd like to know the reason.

Thanks in advance.

[Tdol]

The infinitive would, for me, imply that this was their purpose, while the -ing form just refers to the contents of the lyrics.