No verified information has been found about an album titled 'Strings and Keys' by Charles Mingus released in 1953. It may be a title error or an unofficial recording.
Charles Mingus recorded extensively in 1953, including sessions for Debut Records and other labels, but no known album bears this exact title.
It is recommended to check primary sources such as Mingus discographies or Debut Records catalogs to confirm the existence of this title.