Secondly, it is unfair to say the other performers were second-rate aside from the 'Torrents', since they all sang and played very well.

aside 在这里用作介词，意思是"除...之外"，表示排除关系。 from 是介词，表示"从...中"或"与...分离"的意思。 aside from 是一个固定短语，意思是"除了...之外"，用于引出例外情况或补充说明。在这个短语中，aside 和 from 共同作用表达排除含义。