Disgraceful gloss: for me the song is antithetical to the poem, subverting its premise entirely. Apart from a "bluebird heart" there is no homage or connection.
"I'll keep the light on in my soul / Keep a bluebird in my heart.” No, Bukowski's bird ain't getting out, ever. His is a metamorphosis of becoming a creature in darkness, but perhaps I'm simply nauseated by the shine.
Salud for posting, I haven't traipsed here in a while.