sing

[Nefertiti]

"Sing of good things not bad
Sing of happy not sad"
1. Does 'sing of sth' common usage? Can you give some examples if it's common?

2. In regular writing, shouldn't it be 'sing of happiness not sadness'? 'Of' is a preposition.


"Sing of love there could be"

3. What does the quote above mean?
4. Does 'there' have a meaning?
5. Is it OK to say, "sing of love it could be"? Any difference?

Thanks


Let the world sing along

sing along phrasal verb (from Cambridge)
to sing a piece of music while someone else is singing or playing it:
The radio station played a Billy Joel song, and I found myself singing along to it.


Song Lyrics

[Soup]

1. No, but the structure is common; e.g., think of me.
2. No. Ellipsis 'sing of happy [things], not sad [things]. Of is a preposition.
3. 'could be' = future love
4. It functions as an empty subject
5. No.

[Nefertiti]

re 3. 'could be' = future love
'Could' express the uncertain possibility of future love, right?

What if I change the verse to "sing of love there can be"?
Does it make the possibility of future love higher?

Thanks for the reply.