There are thousands of opportunities for musicians to find musician jobs online.  As a musician looking for jobs it is to your best interest to have multiple skill sets so that it widens your opportunity to find a job.  For example, if you play the guitar you might want to consider learning how to play bass as well. Since the instruments are so similar it will be easy for a skilled musician to learn how to play it.  Once you have a new skill set in your arsenal you can now to apply not only for guitar jobs but also for bass jobs. 

Landing a musician jobs requires being persistent and auditioning for as many jobs as possible. Don’t take it personal if you get the job, instead understand that the audition process is part of the bigger picture of being a musician.