My genre includes a lot of different kinds: rock, pop, classical, etc. Piano music is, however, best for me at work because it never affects my quality of work. Furthermore, it may boost or enhance my job.I used to use CDs as a source of background music or BGM, but recently tons of sources are available online for free.
In this context, ABC Piano would be really good. I think that you would never regret it as long as classical music is your thing.
The problem is that my PC sometimes has a short freeze while this free content is working on background. It remains unclear if this small trouble is limited in my situation or could occur in other situations.