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Light-headedness followed by blackouts typically suggests you have syncope
- a fainting
spell. This is most likely related to vasovagal attack or cardiovascular disturbance.
is another close possibility if syncope is ruled out.
Hearing same song, seeing same images and reading same words in your head are not typical of both syncope and seizure, however it needs to be ruled out in all cases of sudden alteration is consciousness.
I would suggest you to get EKG, 2D- echocardiogram
and EEG under guidance of your primary physician. In addition cardiovascular and neurological examination is warranted. The tests and evaluation will give us some clues to understand truly what's happening within you.
Hope this answers your query.