I dont know about soundchain but i expect a good jump from Musicoin. Musiconomi crowdsale is almost starting i m sure that it is going to affect on the price of musicoin. Moreover there are many people mining musicoin and i dont think they will sell their coins without a good raise.
The fact that Musicoin is mined, I believe, is a positive, as it draws energy from the crypto communinty. It gives it a more independent and firm foundation.