Pianos are the most commonly available VST but finding one that has such a nice tone to it is difficult, especially if it is a free one.
Some just don't cut through but this one by Clark Audio has a superb upright vintage piano that has some really nice tones to it and can easily be used to make your track sound like it has the authenticity of a real piano.
The short video below is here to listen to and see how it can be used in Disco Boogie music, bearing in mind that this is designed as a lofi piano and therefore has a variety of other pre sets included.
If you are looking for a long lasting high quality keyboard controller, then check out the M-Audio range below.
You can watch me demonstrate the pre sets of the lofi piano VST below.