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I think the two are non-relevant and non-collaborative with each other mainly because of how their own platform is designed to be.
Based on the thoughts I present below, I think it would be difficult for the to collaborate. What I'm actually looking for partnership will be 
D.tube is one of the successul Steem dApps that focuses on rewarding video contents published on the Steem blockchain. It also removes third party advertisements and use the data for some purposes. It provides a real great avenue for users for their vlogs and videos and receive rewards in the form of cryptocurrency Steem.
On the other hand, Musing has its different purpose. Its a question and answer platform focused on rewarding users participating in the network. An answer and a question is rewarded by cryptocurrency in the form of Steem via upvotes.
So if you compare the two, its completely different for me. Videos are for Dtube and on the other hand Musing has merely texts as a content. Our answers and questions are text-like features different from Dtube.