The songs are often the best part of Rich Hall's standup shows. So the chance to see an hour's worth of them – fairly rare since Hall won the Perrier award as his country music alter ego Otis Lee Crenshaw 14 years ago – is not to be missed. Tonight's set (excerpted from his recent touring show) is a characteristically baggy confection from a standup who stopped visibly trying around the turn of the millennium. It delivers not an intense hit of musical comedy, but a loosely stitched hour of songs, improv and low-octave growling about the state of romance, Whitehaven and the world.

At its best, the show simply spreads the pleasure Hall and his band take in the songs, and in one another's company. It's about the steel guitar and fiddle, spit-and-sawdust sound of music, not just comical lyrics. By Hall's own admission, his number about a rodeo rider on a Shetland pony only raises laughs after he stops singing it. Elsewhere, though, a song about being spoilt for choice by modern jukeboxes depicts a blissfully funny scene of frustrated romance, which – like Hall's invective later on against Primark, online gambling and the aforementioned Cumbrian town – just keeps piling image upon ridiculous image.

Elsewhere, Hall improvises lyrics around names and professions harvested from the front row. It's a win-win: we love his perplexity when the lyrics run dry. When they fly (a fistfight in heaven that rhymes "seraphims and cherubs" with "Jews and Arabs"), his relief is just as delightful. Some of the interaction I can take or leave – coercing a young man into proposing to his girlfriend, and so on – and one number about fat Montana women in tight jeans is a little unlovely. But in the main, this is likable, down-home country-comedy, with some high peaks.

• Until 21 June. Box office: 020-7478 0100. Venue: Soho theatre, London