tuneful (adj.)

• agreeable
• appealing
• ariose
• canorous
• cantabile
• catchy
• dulcet
• euphonic
• euphonious
• euphonous
• golden
• harmonic
• honeyed
• mellifluous
• mellisonant
• mellow
• melodic
• melodious
• musical
• pleasant
• rhythmic
• rich
• silver-tongued
• silvery
• singable
• smooth
• songful
• songlike
• sonorous
• sweet