Linking my laptop to a smart tv

Recently went into maplin to ask about linking my laptop to my smart tv i was told that i need to spend £40 on a cable and a device to convert my laptop to show up in HD on my tv. I said i'm not really bothered about it being in HD i just wanna play my music through it the guy then tells me this cannot be done without it. i'm sure it can be done without it was just wondering if anyone knew how or could point me in the right direction? Thanks........
 
Thanks alot you just saved me £40!! :) Sorry took awhile to reply was checking to see what connections i had on my tv and just found i had a USB port i knew nothing about and i can play movies and picture slide shows now thanks alot well chuffed :)...............
 
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