Storing Music on SD card

I've just bought a 128GB SD card for my macbook pro retina mid 2014 13" and when i download music from to it and try and add it to iTunes rather then use the file on the SD card it copies it onto the mac hard drive. witch makes the SD card pretty much pointless as i only bought it to conserve space on my mac is there a way to make iTunes use the file on the SD card

Thanks in advance :)

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