[LAU] Live performance gear ideas?

[Karen Lewellen]

Hi folks,
I almost put Linux in the subject line,  holding off because there may be 
non-computer suggestions as well.
When I do a gig I much prefer live musicians.
However, once in a while I am in a setting where backing tracks prove most 
productive.
What i find recently though is that trusting the playback abilities of a 
location may be unwise indeed.
So...the question.
Ideas on simple as in compact tools,  stand alone units,  computerized or 
not, that give me the means of performance playback.  Include  ideas for 
amplification so sound carries too.
Using a  built in laptop speaker does not cut it if that makes sense 
smiles.
I am in Canada with u. s. access.
Thanks,
Kare