When people play music, they work with counts… They count in their head so that they know when they have to play which note…
With a x/4 rhythm, a 1/4th note is one count. And a 1/8th note would be 1/2 count.
With a x/8 rhythm, a 1/8th note is one count. And so a 1/4th note would be 2 counts.
The x means how much counts you have in 1 ‘bar’.
So with a 7/8 beat, you have 7 counts. It could be something like a 1/2nd note (=4/8) and a 1/4th (=2/8) note and a 1/8th note (all together = 7/8). So you go like 1 2 3 4 ( that was ur 1/2nd note) 5 6 (that was ur 1/4th note) 7 (and that was ur 1/8th notes 1 2 3 4 5 6 7 1 2 3 4 5 6 7 etc. (but this is quite difficult cause you tend to count to 8 AND you have to make these 7 counts in the same time period in which you would normally make 8 counts).
With a 7/4 beat, you still have 7 counts, but now a 1/4th note is 1 count. So if you want to play the same thing as before, a 1/2nd note will be 2 counts, a 1/4th note is 1 count and the 1/8th not is 0.5 counts. So you end up playing the same in only 3,5 counts. It will sound twice as fast! You can play that same thing twice in one bar, so you will have 7 counts.
So I guess that a 7/8 with twice the speed = 7/4. Or the other way around, a 7/4 played twice as slow is a 7/8. But I think in electronic music this makes no difference at all cause you can set the speed with your computer and I don’t know if you’d bother with how many notes go in one bar and how much counts they take and such But it does make a difference when you play sheet music or whrn you play live, I think!
So yeah I agree with both paranoidmoonduck and Cloudwalker But you can’t have 8 counts in a 7/8! (one and two and three and four as a 7/8, I’m sorry I also don’t understand that?)
ps. Invisible man does indeed sound like a 7/8 (or a 7/4 )