I don’t like listening to music while playing…
What about playing two tables at once? Is it difficult?
Like what has been said above, it really depends on many things. Are you talking about cash or tournaments ? Are you experienced enough ? etc...
From my experience, it's easier to play many tables when playing cash games.
Some players play more than 24 tables simultaneously in cash or SIT & GOs, but less when playing MTTs.
If you are experienced to the point of getting bored playing a single table, open a second one and stick with 2 for a while, then add a 3rd and so on as long as you feel comfortable (So the answer to your question is NO, not difficult at all).
It is also becoming mandatory to play many tables if you play at the micro stakes, otherwise you can't make any money even if you are a winning player.
As to myself, I play 4 tables comfortably now, but as soon as I open a 5th one, it becomes a disaster.
Good luck.