On hearing a Symphony of Beethoven ysis (sonnet)?

"Sleep like the scullions in the fairy-tale." uses the device of allusion referring to the fairy tale, "The Sleeping Beauty" where the scullions in the kitchen were asleep and woke up as soon as Sleeping Beauty woke up. So, you might surmise that the speaker is stating that the little demons of spite and rudeness within her psyche has gone to sleep from listening to Beethoven, like the scullions did in a fairy tale.