This is a biiig soap box for me, so I'll be brief and the op can pm me if they are interested...
I think the first thing a school should do is sing- everyone - teachers as well. Not from music or even words sheets, but by ear and memory. Sing anything, pop (the pitch range is often pants for kids though), classics and yes even hymns and proper church music. Sing in many languages live and dead.
Kids from pretty much birth up benefit from singing (Ok maybe they don't sing themselves for a while LOL but my friends just 2yr old sings nursery rhymes and makes up her own songs too that have a tune and words). they benefits are huge- the fun of a group activity, better concentration and memory, counting skills - ever tried singing times tables and historical facts? Tremendous way of learning them (my dad is 88 and he taught the "slow learners" in junior school in the 1970s . He took his guitar, wrote songs and they learned - he even had a song called "Sam Pepys little black book" about the events of the 1600s ).
Listen to amazing music performed really well- my kids primary had something classical and rousing to walk into assembly to every time and were expected to sit and listen till everyone else was settled.
Go to concerts or have live music in school. From the local secondary school band to people you (gasp) pay eg African drummers or a troup of mediaeval Waits with very interesting instruments and stories.
Perform often as groups/small group and solos. Perform to school and parents.
Move on to reading music yes- it's a great skill- but if the year2 kids can sing and are mostly starting to read words, if you show them " the dots" they'll start to decode them by themselves and formal stuff can come later.
And of course individual instruments. Locally there is a "whole class" initiative that is funded for a short time but that needs to continue really.
I wouldn't bother with grades/medals etc unless that suits you and the kids- it's a real pain LOL
And yeah THE RECORDER IS A REAL INSTRUMENT!!