Singable (adjective)

1. Capable of being sung or suitable for singing.
2. Easily sung or melodious.

Origin:

Early 19th century, from "sing" + "-able".

Examples:

1. The song was singable, but the lyrics were cliche.
2. The melody was singable but the rhythm was too complex.
3. The aria was singable but the range was too high for most singers.
4. The song was written in a singable key for most singers.
5. The song was singable and catchy, it quickly became a hit.