Seeing that it's a tribute to a vintage Music Man amp-- which is no longer being made, then I think that's kinda cool.
Back in 2011 when our city's baseball team was in the playoffs and headed toward a World Series win, there was this incident with the "Rally Squirrel"-- a squirrel sprinted across the diamond and over home plate as a pitch was being delivered-- then ran up into the stands. It's on YouTube. The squirrel made a few more appearances and it was a local sensation and became an fun bit of lore.
My brother immediately got the idea to make t-shirts with a twist on the MLB logo-- the red, white and blue one with the batter swinging at the oncoming ball--but in ours the batter was replaced by the outline of a squirrel's profile and its tail was in the portion of the frame where the bat would have been. And the oncoming baseball was replaced by an acorn. It was the cutest thing ever-- and we knew it would be a hit. So we bought a bunch of blank t-shirts and some basic screen printing stuff and made a bunch of these shirts and hung them in our apartment while the ink dried.
So during some of the following game days at home, we took our shirts down by the stadium to see if we could sell some. There were a bunch of peddlers down there selling knock-off MLB/ Cardinals t-shirts with logos and trademarks and all of that. It felt weird to stand amongst these shady people with our little homespun shirts that we made because we loved the excitement of the post-season in our city-- and if we could make a few bucks, then cool.
Well, some official sort of people showed up and started running off the peddlers for selling counterfeit MLB merch. We didn't know if we were gonna have to leave or what. We started to get nervous. They looked at our shirts and wanted to get on our case for trademark violation, but they really couldn't do anything about that-- technically we didn't have a license to sell merchandise on a street-- but they could see that we weren't like the rest so they sorta just grumbled at us and let it slide--and we stood there until we sold most of the shirts and left.
We would constantly get stopped while wearing these shirts in public and people wanted to know where we got them and where they could get one. So we tried to always keep some on hand until we finally ran out. It was a fun time.
So yeah, I think this little nod to Music Man's logo is a tastefully done sign of respect.
Yes, they clearly started from the original logo and modified it. But it is in a spirit of respect and openly quoting the intent with no intent to deceive, so I'd go gently with the "ripping off" verbiage, thanks. It's a little OTT. Whether it's a violation of relevant trademark laws worthy of legal action is not for us to decide. EBMM pay actual real experts to make those decisions and do that stuff.
Personally, I prefer ye olde medieval minstrels hats to 1970's Clapton hairdo.