Netbooks are not known for their ability to run new games but luckily there are good, a bit older games that may still be entirely playable and enjoyable. I just learned that Electronic Arts has released Command & Conquer: Tiberian Dawn (1995), Command & Conquer: Red Alert (1996) and Command & Conquer: Tiberian Sun (2000) as freeware games -- Tiberian Sun was released yesterday. They can be downloaded from CommandAndConquer.com.
Edit/Add: Here's a Spotify link to Frank Klepacki's music. Klepacki is the man who made the Command & Conquer soundtracks!