An aside, music related, been looking up the latest Till Lindemann touring band, Constance Antoinette Day, a modern multi instrumentalist, which is more common than i could ever imagined, with a caveat. In Constance performances the timing and hand movements bely what you hear at live gigs, perhaps genuine skill ( she has that overall, from other online clips ) or "managed" live performances, IEM systems could allow click track timing for any pre recorded aspects to live performances, never be sure unless someone spills the beans... all the same the performances translate very good to my online eye... modern is good also, just possibly not as skilled as demonstrated in the older clips here.
"Doubling" on instruments has a degree of competencies factor, do and have done it myself, basic make do skill to "no one more surprised than me" element on certain instruments. Modern musicians carry this forward, a quick look at available young musicians in looking for band ads, reveals "band in a person" common theme, how good they are is not covered. Suggested, send me your live sound clips, has a near zero reply... there are the gifted, always the case, as for the rest, am yet to be won over.
Step up and assist any young prospective musician, first element, real assessment of skill, not the imagined. j.