I found this music composer on YouTube who blended most of the Batman film and TV themes together to create one single arrangement.
Here is one video which he plays the Junkie XL theme halfway thorough it. I must say, this is exactly what I thought Danny Elfman's score for Josstice League was going to sound like, instead of the bland and forgettable score we got.
https://www.youtube.com/watch?v=SBlK1V42jbk
There is another video of Goldenthal's theme blending together with B89's Descent into Mystery.
https://www.youtube.com/watch?v=XL61pjpAqP4
This is his own operatic take on the 1966 TV theme.
https://www.youtube.com/watch?v=z1Cj0kL-q5o
Really good stuff. (https://www.batman-online.com/forum/Themes/default/images/post/thumbup.gif)
Samuel Kim (https://www.youtube.com/channel/UCuoKuTCQ9dmPIgOgyLm9HgQ) (also mentioned in this thread (https://www.batman-online.com/forum/index.php?topic=3933.0) and this (https://www.batman-online.com/forum/index.php?topic=2745.msg61962#msg61962)) is also one of the best at this.
This is an arrangement of the Elfman and Zimmer themes.
https://www.youtube.com/watch?v=z3lKf6qsuWk
A newer, longer arrangement of The Batman theme with the Imperial March, including Duel of the Fates.
https://www.youtube.com/watch?v=IcIlsP1Y7Ko
Also, AtinPiano (https://www.youtube.com/channel/UCkPRBxO9SbNE-2h0XXKz-jg), he's done very good piano versions for many well known themes, plus piano versions of Samuel Kim's arrangements. This is a piano arrangement of The Batman's trailer music - he also incorporates Elfman's theme.
https://www.youtube.com/watch?v=-kAghaewp6g
And posting this just because this is how I first heard his work, and must have listened to it a thousand times.
https://www.youtube.com/watch?v=kWbWZVS8q6U
Gotta to love what some talented fans do, without any kind of restrictions.