Invaluable. It is a true measure of progress, skill, and where your weaknesses are.
Anybody can play what they create, or should be able too, but to learn to play other people’s music is the pinnacle challenge for many, most or all musicians.
I dont think you would find an instructor, course of lessons, or book on music that does not draw inspiration, examples of, and full songs as lessons.
Most of B2B draws from popular songs, for these very reasons.
Classical music is 99.5% covers
Even Jazz is pretty much covers, but there is a lot of room for interpretation, with freedom to change and experiment, however it seems imperative to learn from the original, or most popular versions prior to taking flight on your own within the song.
I am not surprised about learning songs for me, and for me it is also a personal goal.
What surprises me is how much more more open I have become to many songs, bands and players BECAUSE of the bass lines, that I would not bother with a 2nd listen, let alone listen all the way thru these very songs if it were not for my appreciation of the bass line.
Also
It has given me new found love for old favorites.
Loose examples are.
Metallica, I am not a Fan AT ALL, but I have learned to appreciate Cliff Burton so very much, that I have started to learn some songs. My most recent cover, I posted 2 days ago was “ For Whom the Bell Tolls”
And
Pantera - I LOVE PANTERA, always have, BUT, much of this love was from the great songs and lyrics, and INCREDIBLE guitar riffs, licks, sound, and overall playing of DimeBag. I played guitar as a kid, with him being ( still is R.I.P. Dime) my favorite axe man.
But, I have been learning Pantera bass lines, and am finding I like Rex Brown as much as I like Dimebag. His bass always seemed over shadowed, by the best metal guitar player I ever heard, but now that I am playing the bass lines, I find Rex to be incredibly talented, well versed in music, and original and creative in his own right, something that went right over my head in the past., that I still may not have realized without learning some of his lines.
I am working on a Pantera cover next, “Mouth for War” gonna take a bit to get it right, it’s not easy by any means.
And
Then are the bass players I always knew and loved for their bass playing. Geezer Butler, Les Claypool, Geddy Lee, Tim Commerford, Eric Wilson, etc…
Of course, to get good enough to play these songs flawless will be a good indicator to myself, where I am within my playing, and where I still want to go.
Plus things like Billie Jean. I have never been much of a MJ fan, but the world class musicians that he worked with, and the awesome bass that came from those songs, like BJ and Thriller to name a couple, are epic and iconic (even if created on a keyboard / bass synth) and would have largely remained under appreciated by me for the rest of my life, had I not learned bass, and had I stayed closed minded to all but a few genre, and to particular artists.
Covers are part of being a musician, they go hand in hand, IMHO, and I can’t imagine anybody that has not, or will not learn a cover song, except for some people like Johnny Dept, or Billy Bob Thornton or some totally outrageous actors that cross to music, but I still bet they have, at the very least, learned a cover or two.