At the Ystad Jazz Festival in Sweden last month, scheduling caused me to miss a concert by the young Swedish singer Hannah Svensson and her guitarist father Ewan. Someone who did not miss it took along a camera and posted videos on YouTube. Svensson père, if that is an appropriate designation in Sweden, is a seasoned guitarist with senses of timing, swing and appropriate chords that create effective accompaniments. She is a singer with control, intonation and lyric interpretation that make her worth following. According to her website biography, Ms. Svensson is 26 and from Gothenburg on Sweden’s west coast. She had been a piano student for several years when at 17 she heard Eva Cassidy recordings and decided to become a singer. Here are father and daughter in a song also included in the Svenssons’ recent album.