What does "course" and "so" mean here? Does "so" mean the same as "kind of"?
In this context, "course" means "period" or "length of time." Thus, we can understand "over the course of a year and a half" to mean that she was occupied with her album "over the period of a year and a half." "So" here means "thus" or "therefore," and she has used this word to express why her album is meaningful to her. Ex: I worked on my thesis over the course of four years. Ex: It's my most significant work, so it's quite meaningful to me.
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