Skeetendo

Yesterday I try to import some songs of pokemon crystal to pokemon gold, first I import the Legendary Dogs theme, but when I copy the song and rearrange the channel, I can only lizten the first part of the MIDI, only plays 5 seconds, but after the melody stops.

And I see the music bytes of the melody, but I see some diferents bytes In Pokemon Crystal, and my guess is: Why I cant import songs directly of pokemon crystal? and if the music format on crystal is different (What is the format)

Thanks