808 peaked at number eight on what?
808 (song):  "808" was a success in the United States becoming the group's first top ten hit peaking at number eight on the "Billboard" Hot 100 and top five peaking at number four on the Hot R&B/Hip-Hop Singles. Billboard Hot 100: The "Billboard" Hot 100 is the music industry standard record chart in the United States for singles, published weekly by "Billboard" magazine.
Billboard" Hot 100