Play instruments together
In TS3 you used to be able to "jam" together on different instruments. Can you do this in TS4? If one sim is playing the piano and another has a guitar, can they play together?
Forum Discussion
With a group function you can get sims to play at the same time, but they don't really play together. I don't know if you care about that distinction, the music they're playing is definitely not at all connected to each other, so it'll just be a lot of discordant noises. BUT visually at least, if you put a bunch of instruments next to each other, you can at least get them playing at the same time in proximity to one another.
