"One Of These Days I'm Going To Cut You Into Little Pieces."  I'm guessing, especially in 1971, that was a bit violent for a lot of folks so the title was shortened to just One Of These Days, and Nick Mason's vocal debut later in the song was so processed it's barely intelligible.  Pretty safe.  A great example of a young Pink Floyd sharpening their teeth.  Out of town?  Listen live on-line around 5:20pm.