praise vs sing the praises of

praise

verb

  • To give praise to; to commend, glorify, or worship. 

noun

  • Commendation; favourable representation in words. 

  • Worship. 

sing the praises of

verb

  • to commend someone's attributes to others 

How often have the words praise and sing the praises of occurred in a corpus of books? (source: Google Ngram Viewer )