It is widely known that music can be used to induce a person into a trance like state, aboriginal tribal music is such an example of music used in ceremonies to induce such states. However, the claim that it can induce a near narcotic euphoria like that story describes is just as realistic as the "Brown Note" and if those individuals in the story were examined further, it would probably be shown that their mental expectations is what caused their "high" and not the music itself.
ack-ack
HA! You beat me to it.

Anyone that plays the drums, or has participated in a drum circle can tell you that a trance-like state is possible. Especially after a good hour or so of non-stop drumming.
Claiming that it can mimic the effects of specific narcotics or drugs is a bit silly, at this moment in time. As we understand more of how the human brain works, it may become possible, but I'm not quite sold on it, yet.