tremolo vs wobble

tremolo

noun
  • A variation in the volume of a note or a chord, evoking a tremor or quiver. 

  • The device in an organ that produces a tremolo effect. 

  • A rapid repetition of the same note, or an alternation between two or more notes. It can also be intended to mean a rapid and repetitive variation in pitch for the duration of a note. It is notated by a strong diagonal bar across the note stem, or a detached bar for a set of notes (or stemless notes). 

wobble

noun
  • A tremulous sound. 

  • A variation in the third nucleotide of a codon that codes for a specific aminoacid 

  • A low-frequency oscillation sometimes used in dubstep 

  • An unsteady motion. 

verb
  • To move with an uneven or rocking motion, or unsteadily to and fro. 

  • To tremble or quaver. 

  • To cause to wobble. 

  • To vacillate in one's opinions. 

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