Mac Miller - Knock Knock (Vocal Version) is a English album released on Dec 2011. Mac Miller - Knock Knock (Vocal Version) Album has 1 song sung by Tribute Stars. Listen to Mac Miller - Knock Knock (Vocal Version) song in high quality & download Mac Miller - Knock Knock. Download Mac Miller - Knock Knock - Single. Genre: Hip-Hop/Rap. Mac Miller Knock Knock free mp3 download and stream. Listen to music you'll love! Create a custom radio station from your favorite songs by Mac Miller on iHeartRadio.