Even though you already have an audience, they're for a different niche and promoting a different kind of content might end up with a different result.
- In other words, little to no earning for a long time if it'll be a completely new channel ^{[even with the possibility of some promotions]}.

In regards to having at least 10 songs, IMO it won't be good enough ^{[even for the start]}.
- You need to be consistent for such thing and that 10 songs wouldn't be enough for more than 2 weeks worth of content ^{[it'll still depend on your publishing frequency]}.