Dave Bonta's "Alone" is about a quiet, complete happiness. The speaker is alone, but not lonely. The poem makes this clear right away by building a small circle of company around that word: a wife, a lute, and the feelings of pleasure and contentment that come with them. "Alone" here seems to mean undisturbed, with nobody else around and nothing else needed.
The structure does a lot of the work. Each line begins with "with," so the poem feels like a list of blessings being counted off one by one. The lines are short and the language is simple, which suits a speaker who isn't looking for anything more. The last line, "with great content," closes the poem on a settled, peaceful note, and the repeated "great" in the final two lines shows how deeply he means it. The mood is calm, warm, and gently satisfied. Nothing happens in the poem, and that is the point: being at ease is enough.