Psalm 150

Where? Why? How? Who? The unnamed psalmist who claims last place in order provides the answers to the four questions about worshipping God. I spent about a minute reading this psalm, but quite a few more pondering the writers thoughts. Was the writter listening to critics who voiced numerous excuses for not worshipping God? Why doesn't the psalm address when to worship God? Since the bulk of the psalm dealing with musical instruments was the writter one of the levitical musicians? Was this psalm the fruit of a long time battle with sorrow or a flash of inspired writing? Whatever the circumstances surrounding its origin I'm thankful that God led someone to include it in the text.
Stuart