The most important lyric is usually your title but it could be an emotional point instead ('Ah, look at all the lonely people' rather than 'Eleanor Rigby'). This songwriting tip will cause your lyrical highpoint to stand out more effectively, and that will go a long way towards making your song unforgettable.
Carry That Weight, Come Together, Eleanor Rigby, Get Back, It's Only Love, She Loves You
also Be My Baby (The Ronettes), Bridge Over Troubled Water (Simon & Garfunkel), Rolling In The Deep (Adele), Somewhere Over the Rainbow (Judy Garland)
Ticket 13: Make The Vocals Stay On Non-Chord Tones
Ticket 14: Write An In-Key Melody Over Out-Of-Key Chords
Ticket 36: Emphasise Key Lyrics By Changing Chord On Every Syllable Or Word
Ticket 39: Don't Start The Melody On The First Beat
Ticket 50: Stay Off The Root Note In The Melody
See the full list of songwriting tips here - Tickets To Write
See also Where Should You Put a Song Melody’s High Point?