Music at a park

Spotify playlist?

Spotify premium, but only if you have access to speakers and amplifier and electricity. Other than that, you may need a pro that can provide all those things. Or a pro live musician (a solo violinist or harpist is always beautiful).

I would hire a DJ to keep the flow of the ceremony going. But then again that's only because I went to a disaster DIY playlist wedding where the wedding party ended up walking down the aisle to the brides song and the bride ended up walking in silence....it was horrible. Hiring a DJ is more than worth it in my personal opinion.

For the price of the extra time for the DJ and the DJ travel time, you may be able to get live musician(s) to come and play. Also, I think it adds a nice element to the ceremony.

I'm also a wedding singer. I've sung with a guitarist and it was perfect for the park. Low key but elegant. You don't have to worry about any technical difficulties. It'll be worth the small fee for sure. Lastly, check to see if the park even allows amplification. They may not.