Ruthven Todd is very clear about it.
Red roses for a blue lady. Staying with my mother, we listened to this song at least six times, singing along.
'Un poème n'est jamais fini, seulement abandonné. A poem is never finished, only abandoned.' Paul Valéry
When memory fails, songs stay faithful.
After close reading of about 1500 poems, all shapes and sizes, you start to think about shape and shaping a lot.
Sometimes poems are time bombs.