Thanx Tom - that's mostly it!
OK here goes......
1)"This is because I ALWAYS play an original, live chord accompiniment >>
***I play the full chords with my right hand, mostly because I used to play BASS with my left hand before arrangers were invented. All I really need is a simple drum beat, a Bass tone, and a piano tone to play any song I know.

2)If you use right hand for chords, then would that mean that the Full Keyboard mode in psr2k is your preference?>>
*** No - I still use a split configuration so I can finger more intricate chords with the right hand that enhance the tonality without making the aranger cough & spit up. Full mode gets wacky sometimes with lots of passing tones or "substitute" chord voicings. I play very simple with the left, and add spice with the right.

3)Whats a single note melody?>>
*** Tom hit this one - Single notes at a time, like a singer would do with a melody. I want to hear MY chords and rhythm - not just the arrangers "stock" rhythms. Maybe that's why I like the more simple approach - it lets ME add the "color" and life to the arangement.

4)Whats a signature line and whats DC5?>>
*** Tom's right again - there are some songs like "Satisfaction" and "Day Tripper" and "Pretty Woman" that have very identifyable lead (solo) lines as a "hook" or signature to the tune - you pretty much HAVE to play these lines if you do the tunes.
DC5 refers to "The Dave Clark 5" - a British Band that came to the states in the 60's during the invasion. They were very much like the Beatles, and are one of the few examples of a band where the name of the group was NOT the name of the guy out in front of the band. Dave Clark was the drummer !

5)Whats the difference between a piano player and solo player?>>
*** A piano player is used to creating a "full arranmgement" within the chord structure of a song. That's why piano is such a complete instrument. It can do melody, harmony and rhythm all at the same time. Tough to do on a flute, for instance.
So - a flute player would be a solo instrument. Some players finger a chord with the left hand, and let the arranger do all the rhythmic work, while they play a solo line with the right hand (like a flute sound). This will sound ok, but can get predictable and repetitive as you play the same pattern for different songs. That's why I play my own chords OVER top of the arranger - that way I won't sound like every other user of the keyboard I have. Each pattern becomes "specific" to my style for the song, because I'm doing it live & fresh each time.