Can I use Blackberry as Sonos music source over WiFi?

[Watchman]

I have an old Blackberry - a Bold 9600. It has a 32GB card inside with all the music I need for a particular occasion I'm hosting this weekend. For reasons of security I don't want to take my laptop, and my Google Nexus 5 phone doesn't have enough storage to hold all the files I want. If the BB was stolen, lost, dunked in a pint - it has no ££ value and I won't be upset.

My BB can access the WiFi network but I can't "see" it from my laptop on the network, therefore the Sonos controller cannot either.

I had hoped to attach the BB to the WiFi in the venue I am visiting, and let everyone with the Sonos controller access it.

Possible, or not?

TIA.