だいじょうぶ

I will never forget that soft, kind voice reverberating inside my head with that big smile adorning his face

from the last time I saw him at Nagoya saying,

“だいじょうぶ。 だいじょうぶ。 だいじゅぶ。”

I don't know how to say it properly with my broken Japanese but here's my take,

"一志さん。 美しい歌をありがとう。"
"My prayers are with you."