I‘ve often heard her sing this song.与I often hear her sing this song.使用了完成时态,有什么不同的吗?

I‘ve often heard her sing this song.与I often hear her sing this song.使用了完成时态,有什么不同的吗?
I‘ve often heard her sing this song.与I often hear her sing this song.
使用了完成时态,有什么不同的吗?

I‘ve often heard her sing this song.与I often hear her sing this song.使用了完成时态,有什么不同的吗?
前：我曾经常常听她唱起这首歌.（现在不再听到）
后：我常常听她唱起这首歌.（现在还会听到）