Definitions of harmonize:

• verb:   go together

  Example: "The colors don't harmonize"

• verb:   bring into consonance, harmony, or accord while making music or singing
• verb:   bring into consonance or accord

  Example: "Harmonize one's goals with one's abilities"

• verb:   bring into consonance or relate harmoniously

  Example: "Harmonize the different interests"

• verb:   sing or play in harmony
• verb:   write a harmony for