Comment by PhilMH:
US Copyright Office registration says September 17th, viz:
Cornerstone / [performed by] Styx.
Relevance:
Type of Work: Sound Recording
Registration Number / Date: SR0000012849 / 1979-10-15
Title: Cornerstone / [performed by] Styx.
Imprint: c1979.
Publisher Number: A&M Records SP-3711
Description: 1 sound disc : 33 1/3 rpm, stereo. ; 12 in.
Notes: Lyrics on container.
Copyright Claimant: © ℗ A & M Records, Inc.
Date of Creation: 1979
Date of Publication: 1979-09-17
Authorship on Application: sound recording & artwork: A & M Records, Inc., employer for hire.
Contents: Lights -- Why me? -- Babe -- Never say never -- Boat on the river -- Borrowed time -- First time -- Eddie -- Love in the midnight.
Names: Styx
A&M Records, Inc.
Comment by Warlock:
Styx's website and facebook page has confirmed that Cornerstone was released on October 19, some LPs have entered the charts before they were released.