commas vs no commas

sportsguy7

Is it better to separate key words in store heading with commas or no commas, just a single space?In the music category on ebay my world, you need commas to separate bands to be able to be searched by favorite band.

sportsguy7

Thank you Hersh.You are much appreciated.

Fred333

I usually use  free keyword tool to find the most searched words and then us a comma with a space in my header.