I think it depends on what you plan on doing. If you have a decent amount of instruments then the music lessons will help to push you back into a good range for earning starbits. In the off-chance you don't want to do music lessons but don't want to let go of the card, you can always list the card for a price people won't buy and your stats will not include this card.
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That a good idea. But i think i will sell it to buy more packs .