I do 4 essay based A levels and I do the EPQ. It's fine to be honest but in exam seasons the pressure is definitely on. I think doing 4 is a good option if you can't definitively choose 3 because that's why I chose 4. However, if they're not relevant to your Uni course, try taking 3. The workload is clearly higher, you won't have as many frees as everyone else so you'll have to do more at home. If you're dedicated I can't see why it wouldn't be a problem, but remember, A*AA is better than AAAA. sometimes doing 4 can stop you focusing on getting the best grades possible as you have more subjects to think about.
Also, if you want to do English at uni, English Language isn't required. If you want to do Music, it isn't either. Just something to consider.