Is there a metaphorical meaning to this line? (心の望むままに情欲を唄おう)


The line in question:

> 心の望むままに情欲を唄おう。

Context: The speaker is monologuing about how terrible society is, especially
how corrupt those in power are, he starts to sound nihilistic and basically
says he'll act like a criminal because that's what society wants him to act
like.

> 見下される程度の、唾棄される程度の悪に何の意味があろうか。全てがペテンなのだ。自分がその嘘に乗らずしてどうする。ああ、心の望むままに情欲を唄おう。

He then mentions the many ways this world could end up being destroyed, by the
greed of those in power, by enemies waging war on them etc. But when the world
does end he is determined to be a criminal until those final days.

Now back to the question, I don't understand what the speaker means by
"心の望むままに情欲を唄おう", translating it literally gives me an odd result "(I/they?)
will sing their desires as much as they wish" so I'm thinking there's a more
metaphorical meaning behind this that I don't know about yet. I know "心の望むままに"
is a set phrase that means "as much as your heart desires" but the 情欲を唄おう is
quite confusing. Any help appreciated!




情欲を唄う is _not_ an idiomatic set phrase with a surprising metaphorical meaning.
うたう can take various objects and mean something along the lines of "to sing
about ～". For example 愛を歌う is "to sing about love", 春を俳句に詠う is "to
recite/compose a haiku about spring". I think it tends to imply the object is
something to be celebrated or glorified.

