The act of observation focuses attention, reason, and the senses in such a way that the event has a confrontational character (the observer versus the observed). On the other hand there's experience, where reason and the senses don't search and investigate, but are enveloped.
This kind of event, the open experience, can also be called observation, and rightly so. But it's not the scientific type that usually takes place in an isolated environment, but observation like Goethe understood and practiced it, in the essential environment and context of whatever is observed. The same bird will sing differently being free or caged; a plant will not develop and move in the same manner if it's in a pot indoors or in a field under the elements.
In music there are at least two perspectives: the listener's and the composer's. In the former, what's been said so far is not so relevant, being that (s)he has little or no influence on the work itself and how it's presented. The composer, on the other hand, can have a creative approach closer to making enveloping music than to one meant to be observed like an object.