Señor Hammer,
I do find that the music of the 70’s goes over very well at the nursing home and senior venues. Barry Whites “Love Theme” is a great instrumental, Copacabana works well as an instrumental too. For the Eagles, Hotel California works great as an instrumental too. I have a fake book published by Warner Brothers called the “Classic Rock Fake Book” Also Hal Leonard has produced a good series of “Pop Real Books” with the music the 70’s to today in lead sheet format.
But really you should give singing a try! I used to do all instrumental too, but once I started singing just a few years ago ( with no prior training) I felt like i connected much more with the audiences and got much more compliments and more business despite not having the greatest voice. If you can sing in tune
there’s no reason you should be singing at your shows!