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）