1. summer, i've said why i called it summer even autumn was there yet passed;
2. 3-pc transition of music, u r absolutely right, first time doing this, noticed a 2-3s gaps there, did not decide whether to make seamlessly it or just leave a slit there, for this is a song-music-movie 3-style one,
3. transit of images, u r right too, tried shadow out shadow in, or white out white in, did not like it, but surely it could be done blended more naturally,
4. thanks yy, cordially , form the deep bottom of my cardia ;
5. hope and expect your help and more in the time coming..... :)