Instruct: Classify Amazon reviews into positive or negative sentiment
Query: smooth and vibrant

I was looking for a pair of earbuds to replace the originals from my ipod nano. While they worked fairly well, they did not stay in my ear very well, neither did they give me the tight and non-rattling base that I was searching for. After doing some research I chose the Sennheiser buds... and what a difference. Not only did they stay in place but the sound was outstanding...putting the unit in a class by itself. I heard notes never heard before on my ipod recordings. It seems as though the ipod and Sennheiser buds are a match made in heaven. And oh, that base!