No, and yes. The SAID concept, which argues that the brain creates Specific Adaptation to Imposed Demands, relates to neuroplasticity modifications. Therefore, if you practice the piano daily, pick up new chords, and create new cortical maps, the brain will change to accommodate the requirements of your new occupation. The brain prioritizes the development of new neural pathways, but if you stop performing or, in a much more illustrative case, if you tune the piano differently and have to master all the chords over, it will cease enforcing the existing ones. Now, it does not always follow that the old channels have been fully turned around just because they are not being strengthened. You never entirely lose some talents, like biking, you only grow rusty.