"Big Blue Note" is a song co-written and recorded by American country music artist Toby Keith. It was released in September 2005 as the third and final single from Keith's album Honkytonk University. It peaked at number 5 on the United States country charts. Partway through the single's release, DreamWorks Records closed its country division, so Keith promoted the album via his own label, Show Dog Nashville. Keith wrote the song with Scotty Emerick.