After a short discussion of the actual typescripts and manuscripts of Lowell’s letters, this chapter centers on the published books of letters, which have become a central, rewarding part of Lowell’s oeuvre. On the level of style, Lowell’s letters can help us hear the poems better: above all, they make audible the comic tones under-recognized in his poetry. On the level of content, the letters shed light on Lowell’s literary contexts, his interests, and his thinking in specific poems: When Lowell writes to other poets about their work, he frequently reveals quite a bit about his own. And finally, the letters create an autobiography that encompasses gossip, complaint, apology, argument, critique, and confession.