Maybe , Piano had a special place in your heart and it reminds you of certain someone just like 'Distant Everyday Memories' Piano reminds me of her (My Life's Akari) , it reminds me of the love that never happened for me , so this Piano will always have a special place in my heart , hearing it reminds me of her , I know I can't be with her but yet this feeling of longing for her will never die , so if it makes your heart tight , it's not the piano but the feeling that originates after hearing it