Thanks for your response, Sean. I am using Wolfram Alpha Pro Web API (that responds with an XML response).

Also, I am not asking it to "Play" any multimedia content, I am just trying to tag certain phrases in the input text as song name, band name, etc. Yes, you are absolutely correct that this is called NER problem in conventional literature.

For example, if I give an inpul "Play lithium", I want wolfram alpha to confine its NER knowledge to "Music" domain and suggest that "Lithium" is a song, and not a chemical element. Are there any filters that I could apply while running my queries to confine its domain to music?

Thanks!