Final answer:
The King's remark about Mozart's opera as having 'TOO MANY NOTES' reflects a perception of over-complexity similar to critics' views of Baroque art, which utilized movement and diagonal lines for dramatic effect.
Step-by-step explanation:
The King said that Mozart's opera had 'TOO MANY NOTES'. This comment highlights a perceived excess in musical complexity, which some classical music critics of the time might have thought detracted from the listener's experience. This perception is parallel to the critique of Baroque art, where Baroque artists were known for their interest in movement and complexity, often using diagonal lines to convey this. Similarly, the compositions in music sought to convey movement and emotion, which, during the transition to more progressive composers such as Berlioz, Strauss, and Wagner, began to challenge the auditory sensibilities of audiences by pushing the boundaries of musical complexity and acceptable norms of the era.