Interesting. The last album I listened to was ZZ Top's Tres Hombres. Both albums were produced at around the same time but ZZ Top with Texas roots, Alex Harvey in the UK. The sound and themes could almost be interchangeable. I could easily see most of Harvey's songs belonging to ZZ Top and vice versa. Excellent blues rock. It's when the Sensational Alex Harvey Band moves on to glam or "heavier" rock that they start to be less enjoyable.