I wish to connect my musical keyboard to linux (figured that part out)
But I would like to know my options for Virtual Grand Pianos.
The Linux MultiMedia Studio (open source) and the EnergyXT (closed source, running natively under Linux) mentioned in this answer, is great for Music creators/producers and even performers. Placed here just for your convenience:
Additionally, the LMMS Wiki related to Midi, can be helpful for you, reach it right here: http://lmms.sourceforge.net/wiki/index.php/0.4:Using_MIDI
I have tried some midi keyboards in the past, unfortunately I don't have them right now to run a test for you but I experienced some issues the first times and had to patch a few things in order to get the keyboard fully working. And I couldn't fix a major issue with a model, which I can't remember (I don't own it anymore), as the instructions were about to patch the keyboard's firmware itself.
I hope your midi keyboard is more compatible than these that I owned in the past. And if you provide further information about your keyboard's brand name and model it would be really helpful.