A SXSW streaming music panel was unanimous in its bewilderment at certain artist managers’ decision to still withhold from streaming services saying that it is “a big mistake” and that there’s no good reason to do so.

It was Rdio’s Adam Rabinovitz who warned against the decision for managers or artists to deny streaming services new music, calling it a matter of education.

“If someone reads about the Black Keys and makes a decision based on that, then they’re making ...