This is a totally opinion-based question but do you think I should take HL(Higher Level) for IB Spanish or IB Vis Art? I've been thinking about it for quite some time but I'm not too sure.

It depends what you like the most not what other people like and it also depends if your good at it

When an orchestra plays at a concert they might play a symphony (a piece for orchestra) and they might play a concerto (with a soloist). if the solo instrument is a violin the piece is called a “violin concerto”, if it is a piano it is called a “piano concerto”, etc.