That's a great idea, Belladonna, that 365 Day Prompts site.
If anybody is interested in finding more sites with those types
of writing prompts, simply Google "Writing Prompts" and you
will find sites that have as many as 100s of writing prompts on
one page. You can also find many more similar sites by Googling "Essay ideas."

Another similar site is: Site With Over 1000 Debate Topics
That site is designed to aid debaters. Every one, of the over 1000
topics on that site, has both the pros and cons of that topic.

Along similar lines, i would recommend two books:
10,000 IDEAS FOR TERM PAPERS, PROJECTS, REPORTS AND SPEECHES and
What Can I Write About?: 7000 Topics for High School Students.
Both of the above books are available at Amazon inexpensively.

Also, on Google Play Store if you search for 'writing prompts' and
'essay ideas' you will find lots of apps that have numerous more
ideas to give you inspiration for song ideas.

However, i do want to warn you that you need to be careful if you
use the name of a character from a movie or book, even in just
the title of your song, because if that name is trademarked, you
can be sued, even if you only use it in your title.

But my favorite way to generate ideas for songs is this:
Imagine you are talking to someone. It could either be someone
you know well or someone famous you have never met. Imagine
you are explaining something to this person. When you have said
everything that you wanted to say to that person, in your mind,
then write it down.

Then start writing a song using words that are as close as possible
to the words you spoke in your mind. Don't worry about rhyming
and song structure at first. You want to put the main emphasis
on the ideas, at first, so that you can write asong that really
communicates to people on a deep level and says things that really
touches their hearts. Then, once you have the ideas fully fleshed
out you can start to concentrate on rhyming and the song's structure.

I came up with the above technique this past week after imagining a conversation
with someone i know and then realizing that it would make a great
idea for a song. I can' t begin to describe what a fun way this technique
is to write songs. It is not necessary for songwriting to be a tedious
process in which the tortured songwriter bares their soul to an audience that wants to
become even more depressed than they already are. The actual joufulness
that you put into your creative process will be communicated to others
and will make them feel better about their own selves and will raise
them up.

Science fiction writer Harlan Ellison has often been asked: Where do you
get your ideas from? His usual reply has been either "Schenectady" or
"Poughkeepsie."