A Level subjects for Oxford U Music

Have a look here https://www.ox.ac.uk/admissions/undergraduate/courses/course-listing/music
Looks like only music is required so your combination is fine. I'm not sure about your 2nd question but read through the website to see if there's any information on it.

Hiya,
Oxford music alumna (Worcester College, 2007-2010) here. I would advise against taking music tech if you're aiming for top UK universities.
Maths, Music and Physics is a good combination!

hello! my YP is making a level choices this year. please can you tell me why you advise against music tech A level? they are quite excited about it. thank you. x

hello! my YP is making a level choices this year. please can you tell me why you advise against music tech A level? they are quite excited about it. thank you. x

Music tech doesn’t really prepare you for the academic study of music (as would be taught at somewhere like Oxford, where music is an academic degree).
If you want to study music technology on a course that is more technical and less theory driven, then it will be fine. But that may rule out courses at some of the more traditional unis.
It depends what type of undergraduate course and what type of study your YP is motivated by. There is nothing wrong with a vocational course if that is what suits you. But it is not what is on offer at Oxford.

thank you for your reply. they are keen to explore as much music as possible before deciding on which (music) degree path to take. they are considering A levels in music and music tech and a btec in music performance. do you believe this will limit their degree choices? x

Taking those three combined would likely hinder a competitive application to top university music departments (which, as has been mentioned, tend to be more academic and heavily Western classical music-focused)