I got many songs in 128kbps mp3 songs added to my music collection over the years. Is there an easier way to upgrade these songs to a higher quality? Like any programs that can download and replace these songs in the 320kbps version? Updating them manually will take quite a while.

I'm new to headphones. I bought a Sennheiser HD518 a while back and I didn't like the muffled vocals. I guess it's too bass heavy? I also have a Fiio e10k. My budget is under $100. I listen to pop, rock, and mostly j-pop and singers like Aimer, LiSA, and Nano. I prefer something with a clear...