The Eb is such a common chord in Jazz that I'm thinking of tuning down the E string to a D for some songs that use Eb a lot. A good example of someone who didn't tune down and played the Eb on the D string was James Jamerson. He made it sound interesting. Am I just overthinking things? By the way, please don't tell me to get a 5 string. It's a very viable option, but I love my 4 string too much. What are your thoughts? Just a healthy discussion, not trying to change minds or offend.