I get asked every so often whether it’s a good idea for a woodwind doubler to try to have a fairly “complete” set of instruments, or whether it’s better to make do with a few and make substitutions as needed. For example, do you need a B-flat clarinet and an A clarinet, or can you just transpose? Is it worth it to buy an English horn for sporadic use, or can you cover the part on saxophone?
The answers, of course, depend on your goals. It’s hard to predict for sure which instruments will end up being useful or financially worthwhile. And a new instrument isn’t always something you can just hurry and buy when a gig offer demands it.
If your aim is to maximize your income, and some substitutions are acceptable at your gigs, then you should buy as few instruments as you can get away with. Prioritize the ones that are most likely to pay for themselves in terms of new gigs within the shortest time frame.
If it makes you happy to have a larger collection of instruments, and you can afford to make it happen, then there’s nothing wrong with that, either. For many of us music straddles the line between profession and hobby, and being a woodwind doubler isn’t necessarily any more expensive a hobby than boating or fine woodworking or international travel. If you can count the purchase as a business expense as well, then all the better.
Follow the instrument acquisition strategy that best suits your financial situation and personal goals.