The poem is a tiny riddle about transformation, and the title gives the key: the speaker is tone deaf. The first lines picture a lamb changing into a bagpipe, which is a strangely literal image, since traditional bagpipes are often made with animal skin bags. Something gentle and soft becomes an instrument that is loud and hard to ignore. The next line pairs this with another change, "like angel to wife," which suggests how an idealized figure becomes an ordinary, real person once she is living alongside you. The tone here may be teasing or tender, and the poem leaves that open.
Then comes the last line: "I sing in my chamber." The speaker sings privately, perhaps knowing the voice isn't good. The mood is playful, a little self-mocking, and oddly intimate. The speaker seems to accept the awkward sound, as if the bagpipe-like noise is simply what comes out when something innocent turns into something real.