Besides being a guitar player, I also play harmonica. I needed to replace the speaker in my harmonica amp, a Laney HCM60, with something that could deliver quality tone, without the feedback.
I tried the Vintage 30 initially, but it howled like mad. Lean Business promptly suggested the Celestion G12T - 75 and it was a great suggestion. The speaker handles the gritty sound I like without becoming muddy. I am also now able to use a lot more tone control on the amp before I get feedback.
The service I received from Lean Business was outstanding. They didn't hesitate to swap the Vintage 30 for the G12T when I told them I had purchased the wrong speaker. I highly recommend this company and their products.