What happens to my music after the unlimited music pass trial finished?

You won't be able to play it.

The fine print says

Free streaming limited to 10 hours/month after 6 months; unlimited with paid subscription. Internet required; ISP fees apply. Free streaming limited to 10 hours/month after 6 months; unlimited with paid Xbox Music Pass subscription. Xbox Music Pass 30 day
trial continues to a paid monthly subscription unless cancelled. Credit card required. Limit 1 per person; prior Zune Pass trial users not eligible

100% agree. I don't like using my Lumia 1020 as a music device in the gym, since it's just too big. It looks silly on my arm and bounces around in my pocket. I want a small music player like an ipod, but one that is compatible with my xbox music subscription
and isn't made by apple. There isn't such thing, so I purchased a sony Walkman and a Sony Unlimited Music Pass. Now I have a Sony Unlimited Music Pass and a Xbox Music Pass. I paid for a year subscription, but will likely cancel the Xbox Music Pass when the
subscription expires in March 2014.

I have nokia Lumia 520 in my phone nokia unlimited music subscribed.But now nokia music does not plat what is the problem plz solve this

Did you pay for a Xbox Music Pass?

"Free streaming limited to 10 hours/month after 6 months; unlimited with paid Xbox Music Pass subscription.

(
www.xbox.com/.../music-pass )

While there is no notation as to where the information came from, and although Wikipedia is an unreliable source, India does not show on the list of countries in which Music Pass is available according to their page on the subject.

(
en.wikipedia.org/.../Xbox_Music )

I have not found anything elsewhere as of yet, not even on Microsoft's websites. The press release is rather vague on where it is or will be available. It sounds like you may have gotten lucky for 2 weeks before they found out.