Languages/Processes to use for Music Application | Sheet Music, Tabs, Chords

I've designed a method to display and learn songs as sheet music, chord charts, tabs, etc using my basic skills in photoshop, HTML, and CSS. Looking to find a developer to take it to the next level and design an entire web-based platform (with an idea to take it to a mobile app later). It's along the lines of some existing software and was wondering if anyone could point me in the right direction of the best languages to use to program this, do/donts, etc. I realize this has quite a large scope, but any information would be lovely.

Here are two websites that have the interface, features would be different though:

https://tabs.ultimate-guitar.com/tab/eagles/hotel-california-official-1910943

https://www.songsterr.com/a/wsa/the-eagles-hotel-california-tab-s447t1