表演 is a general term for 'perform (v)' or 'performance (n)'; 演奏 is a specific term for 'perform playing a musical instrument(v)' or 'musical instrument playing performance(n)'
You can 表演 (perform) any kind of performance and any performance (表演) can be performed
Example: 胸口碎大石，高空踏鋼線，肚皮舞，單手打蛋，倒掛金勾射球，書法，騎射 and so on
演奏 (n) = (musical instrument) playing ...
要 usually means "want", but there are a few possible definitions to 想, 想 may possibly mean "think", or another possible definition is "want".
When compared, 要 has more confidence in tone compared to 想.