Audio "sound on sopund"recording

I’m new to Cubase and I’m wondering (this is a simple question) How do you record audio on the same track without muting the track I’m overlapping? I need to listen to the track “underneath” to guide myself in order to produce a smooth guitar solo for example…

I believe I just replied to a similar thread.
http://www.steinberg.net/forums/viewtopic.php?f=228&t=82233
Also see
http://www.steinberg.net/forums/search.php?keywords=overlapping