Final answer:
The voice that addresses the reader in 'Song of Myself' is myself, as Whitman uses the first person perspective to speak directly to the reader.
Step-by-step explanation:
The voice in Walt Whitman's 'Song of Myself' that addresses the reader is myself. In the poem, Whitman uses the first person perspective to speak directly to the reader and share his thoughts, experiences, and observations. This personal and intimate style of addressing the reader is a signature characteristic of Whitman's poetry.