The sentence above has no independent clause. It is an ungrammatical sentence.
Explanation:
The sentence above is introduced by the subordinating conjunction "although". Consequently, this subordinating conjunction introduces a dependent clause, a clause which can't stand on its own as a complete sentence because it does not represent a complete thought. It lacks the independent clause to complete its meaning, it relies on the independent clause. Complex sentences must contain one independent clause and at least one dependent clause but the independent one must be there.
The error that makes the sentence wrong is the word of "Although." It makes the sentence like a fragment. It looks like it need another clause to make it a complete one.
He hears honey-like melodies one day while reading. He finds Princess Pea and King Philip by following the sound. He sits at the king's feet to hear the music and talks to the princess.
