Missing music lessons - should school remind him?

[QueenOfAllBiscuitsandMuffins]

Genuinely want to know if IABU or not so I know what course of action to take.
DS is 7. Each week in school during the school day DS has a singing lesson which we pay extra for.
So he doesn’t miss out on the same academic lesson every week his singing lesson is at a different time/day each week.
DH & I remind him at the beginning of the school day when his music lesson is but on a couple of occasions he has missed it because he forgot.

If his lesson was the same time and day each week then I would expect him to remember.
As it changes every week I feel the school should take a certain amount of responsibility in reminding him he is having a singing lesson and making sure he goes.
AIBU?

As for others at DD's junior school the music teacher comes to get the child or sends the pupil before to collect them. I wouldn't expect the class teacher to remember multiple children's changing arrangements.

At 7, he's probably not very good at telling the time anyway just yet.
I'd email the teacher with the times of his lessons for the next half term, she can pin it on her board and then at least she'd know.
In school individual music lessons are a PITA and they miss stuff, but I wouldn't expect pupils to be independently remembering until UKS2.

I vividly remember being bollocked by my music teacher at the same age for missing a lesson - she'd changed the time from my usual slot and as it wasn't in my routine I forgot. When I realised I excused myself from class to go and apologise, and she shouted at me in front of all the pupils she was teaching at the time no wonder I was terrified of her! It's nice to hear that these days people are a bit more understanding of the capabilities of your average 7 year old!

I've taught 8yo+ for seventeen years (and have three of my own) and I'm MIGHTY impressed by any 7yo that could get themselves to a music lesson on time. It's not an age where organisation comes easy. Wife teaches music and at that age goes to fetch.

Second the digital watch idea if the school doesn't help.

My 7yr old gets fetched by the teacher. No way would he remember or be able to tell the time well enough!