The theme is using a custom post type, in this case, “lyrics”. Converting the old posts over to it should be as simple as writing a single query to update the old posts to the new post type.
The query will be something like:
UPDATE `wp_posts` SET post_type = "lyrics" WHERE post_type = "post";
Just as an added precaution, run this one first to ensure that all the posts you think should be converted will be affected and check the results:
SELECT * FROM wp_posts WHERE post_type = "post";
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