Here is a script that will allow you to play piano at most saloons, such as blackwater, valentine, rhodes, etc. I do not take credit for this script, I compiled various snippets and put it together in an easy to install folder that you throw in your resources, and add ensure piano to your server.cfg, the language was also changed to English. piano.rar (1.0 KB)
To use you will get a prompt near piano to press G, and then W to stop playing, this also works for female ped models. Credits go to Mrbohannon for coding this script.