Oh yes, one of my favourite topics
I don't follow a particular YouTube channel or playlist. Some day some song will strike, I'll play it on youtube music, and the app makes up a nice playlist for me. Mostly the more commonly-aired songs, but sometimes there's a rare gem. Last night I started with 'Ye raatein yeh mausam nadi ka kinaara' by Kishore da and Asha Bhonsle. Really nice, soft playlist followed.
For artistes, you can most easily find songs by Kishore Kumar, Mohd Rafi, Hemant Kumar, Lata Mangeshkar, Asha Bhonsle, Mukesh, RD and SD Burman, Talat Mahmood, Manna Dey, Shamshad Begum.
You can start your search with terms like Hindi film songs from the 1950s. Doordarshan has a long-running show Rangoli hosted by Hrishita Bhatt which showcases old songs - you might find a few episodes online. India-Forums used to have a webcast named Retro Cafe a few years ago - I did the cover art for them a couple of times. Don't know if they've kept the archives or not though.
I don't really listen to bhajans etc, but Anuradha Paudwal used to sing those a lot. Mum had a few casettes that I'll have to look for, but the few I can remember are: Satyam Shivam Sundaram, Shyam Teri Bansi Pukaare Radha Naam, Tu Pyaar Ka Sagar Hai (performed this with my class in school), a few more that we used to sing in school - search for Hindi film devotional songs - quite a long list.
Hope this gives you a decent start. I'll post whatever I'm listening to for you as and when
![Smiling face :relaxed: ☺](https://cdn.jsdelivr.net/gh/joypixels/emoji-assets@5.0/png/64/263a.png)