Sure, here are some timeless classic songs that you might want to consider for your all-time playlist:

1. "Imagine" - John Lennon
2. "Bohemian Rhapsody" - Queen
3. "Stairway to Heaven" - Led Zeppelin
4. "Like a Rolling Stone" - Bob Dylan
5. "Hey Jude" - The Beatles
6. "Hotel California" - The Eagles
7. "What's Going On" - Marvin Gaye
8. "Good Vibrations" - The Beach Boys
9. "Respect" - Aretha Franklin
10. "I Can't Help Falling in Love" - Elvis Presley
11. "Sweet Child O' Mine" - Guns N' Roses
12. "Billie Jean" - Michael Jackson
13. "Don't Stop Believin'" - Journey
14. "I Will Always Love You" - Whitney Houston
15. "Smells Like Teen Spirit" - Nirvana
16. "Yesterday" - The Beatles
17. "My Way" - Frank Sinatra
18. "Superstition" - Stevie Wonder
19. "Purple Rain" - Prince
20. "Let It Be" - The Beatles

Remember, music is subjective, and these are just suggestions. Your all-time playlist should consist of songs that you personally enjoy and hold dear.