Band Composition Has Changed??

Much band had been doing this in their journey. From a legend until new band like Avenged doing this. Avenged?? Yeaa, since their drum hero passaed away, if they stiil wanna exist they've been pushed to search for a new drummer. After that? I don't know exactly they still exist or not later. It's all because of market. Fans on a cross way if their fave bandin this situation. Maybe some love old composition, some other learn new one.
Led Zeppelin had a problem to found a new drummer when Bonzo leave them. Some drummer they tried in some concert but they can't found new one.
Band exchanged means preparation for new band character, if they can't suit this with new member, the existance can be worst.
So, what the band needed to stay in exist although have an exchange in their band? I think the answer is song! Yup, song. Band must be create a great song for their existence because it is their pay source. A band always exist if thgey can create a good song and loved by music market.

Keep the music alive!!