Because Mick Jagger and Keith Richards were still honing their songwriting skills, only "Empty Heart" and "2120 South Michigan Avenue" were credited to "Nanker Phelge", a pseudonym for band-written compositions.
På grund af at Mick Jagger og Keith Richards stadig var i gang med at udvikle deres sangskrivning, blev kun "Empty Heart" og "2120 South Michigan Avenue" krediteret til Nanker Phelge, et pseudonym for bandet.