Yes you can, there is a free update online so you are able to play your PS2 games on the PS3. Once you have updated your console through the Playstation network, load your PS3 dics and then swap over for the PS2 singstar game.
Yes, you should be able to play Singstar for the ps2 on the ps3. PlayStations are all made by Sony, and are designed so that when you upgrade to a newer model, the older games are still compatable for it.
You have to update your console through the Playstation network and then you can play PS2 games on PS3. You have to load a PS3 disk first then swap over for the PS2 singstar game and start playing. Newer PS3 models don't support playing PS2 games because support functionality has been removed.
Yes you can use singstar on a ps3 console but only on the older consoles! The new "slim" consoles do not accept old version ps3 games. Although you can still enjoy the game on your ps3 it may be advisable for you to purchase one of the more recent versions of the game for the ps3