Something like the following, assuming you are "user" and you've
rooted your device such that you can "sudo" commands in general.

sudo su -
cd /
tar -zxvf /media/mmc1/n810_pianobar.tar.gz
exit
PATH=$PATH:/usr/local/bin
llib pianobar

I can't think why that won't work. If you google "contact andy valencia" you can get in touch with me more directly and we should be able to shake this out in short order.

Andy