You can put your boots in the oven, but that doesn't make them biscuits.
If you're singing over a background track...AND you're not playing your keyboard...it is Karaoke...in MY opinion...you can call it whatever YOU want.
You seem to want only one, and only one, response.
You should realize that people learn, and benefit, from many replies.
There are no elitists around here...just realists.
There's NOTHING wrong with singing over a backing track...but it is what it is.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.