A Song For You by Carpenters is a heartfelt ballad expressing deep emotions of love, regret, and gratitude. The song's narrator pours out their heart to a loved one, acknowledging past mistakes and expressing sincere appreciation and love. Key themes include the pain of past errors, the depth of true love, and the hopeful plea for understanding and forgiveness. Poignant moments include the lines where the narrator admits to making mistakes and expresses that their loved one was always on their mind, highlighting the enduring connection they feel.