Thanks for the helpful suggestions. The K553 does look like a great bargain, but as you say, I'm not in the USA, plus I'm particularly looking for something compact and portable (we already have full-size headphones for home use). Will check out the Sennheiser Momentum on-ear. Thanks again!

Would be very grateful for recommendations for on-ear headphones – or extremely compact, foldable over-the-ear headphones – to use when out and about. Not aspiring to audiophile heaven – just looking for something that will allow as much as possible of the music to come through, given budgetary...