Ahh, ok

Is that from the song "Babooshka"?

Piano. Professional piano lessons will teach you how to read sheet music which is always a useful skill to have especially if you would like to eventually write music. Also, most electronic music is composed with computer and keyboard so piano experience will help a lot with this.

Drums however is greatly sort after by bands starting out because drummers are hard to find. If you go into playing drums, this will be a separate thing to any other instrument you choose to learn. But, if you master it, you will find it way easier to join a band.

Blue Suade - hooked on a feeling?

When you're in love with a beautiful woman - Dr. Hook

The problem with your question is that, unless they're over 60 years old, not many people will be able to name many unpopular 60s songs. I'm 45 years old and I love 60s music and I can think of many great 60s songs but cannot think of any that weren't liked.

Edit: just thought of one, how about People are Strange by The Doors

You forgot the amount of redditors who insist that lightbulbs aren't real.