I have a 20 fret 4-string....im a begginer soooo what strings should I buy?? Better yet when I should go to the music store....What should I ask for? All i know about bass strings is the thick...I usually use .40 but I dunno what u reccomend...I play metal (just for the record). One more thing...When I buy strings should I say its for a 4string bass or do i have to buy 5 strings and throw the other one away?!?!