Answer:
Albert heard the music and went outside, That is what the first sentence is saying.
Albert heard music when he went outside, That is the second sentence.
Explanation:
The first sentence is saying that he heard the music first and then he went outside of his house, It was only when he heard the music
The second sentence says that he didn't hear the music until he went outside of his house. Meaning he had to be outside.
I don't know if that helps