That melody

I got a problem…
Could you please help me out?
It´s about the lyric of a melody
I remember the melody, but not the lyric
And it goes lalala lalala lalala (x3)

It´s a beautiful melody
And I know that the lyric too or maybe even more
But I just can´t remember… Tell me
Do you remember it?
It´s that one that goes lalala lalala lalala (x6)

I know well how that song makes me cry
Simply it´s beautiful
But I have forgotten the words
I always sing that melody lalala lalala lalala (x8)
And I´ll ever sing lalala lalala lalala (x3)